Talking about people's children is hard, so I've learned. A lot of people are not open to constructive criticism. You mean well and are actually trying to help improve the teen's lives. It is important for teenage girls to know how to do certain things, such as cleaning up after themselves. I feel like you are stuck inbetween a rock and a hard place, unfortunately. There are some people who can sit back and remove themselves from taking it personal, while some parents never will..and will never see a problem with their kids. Does your girlfriend have an active mother that you could ask for advice on how to set rules in the home? [I say that treading lightly, some mothers can make things even worse]. What's your gf's defense as to why the girls should be able to be lazy/have no rules? Have you tried explaining why you think they should have chores and rules? I think once you provide substance, she should see what you are saying. I mean we could even google right now, why is it important for kids to have expectations etc. It would be hard for any logical person to deny once you have solid reasons why it is a good thing. 

I think it's great that you had a sit down before you moved in to iron things out. Was your girlfriend supportive at the time when you two discussed rules and expectations for when you moved in? 

In my opinion even if your girlfriend worked from home or didn't work why should she be waiting on these girls hand and foot they're not 12 months old. If you make a mess you clean up your mess. That's pre-school 101 stuff. That's not even chores. It's picking up after yourself. You have your work cut out for you :/.

You can't parent someone else's children,  especially if they don't want you to. Why atw YOU the one setting up rules? You should never EVER be the one taking charge over rules for concern that are not yours. 

So, here's the thing - your GF has gone for 16 years without creating rules and expectations for her kids, what makes you think they will fall in line because her boyfriend tells them to?  They won't, that's an unrealistic expectation.

Let your GF know that you can't live in this situation unless she is willing to enforce some basic house rules on her children.  But this won't be an easy fix - she doesn't WANT to give them any rules, or enforce yours. 

Stop.. just STOP... with setting rules and sending out chore lists.  It is NOT your responsibility to raise her children.

Ideally expectations for EVERYONE would have been discussed before moving in.  And by that, I mean that you and your GF needed to talk about how things would work with her kids etc.  I mean, did you ever go to her home?  did you see the state it was kept?  If it was messy.. the girls messy.. the girls eating in livingroom etc.. then obviously, you should have been on guard that it might be hard to change the way her girls behaved.

So, right now, your GF is still "doing nothing" with regards to setting expectations.  She is letting you be the bad guy sending out chore lists and laying down the law.  The girls likely dislike you a whole bunch because they resent you being so "hard" on them and having expectations.

I'm not saying your expectations aren't reasonable.. but for your GF and her daughters it may be a huge change... and I can see chaffing at you being so generous to "give them time to settle in before dropping the hammer".

I think you need to have a sit down with your GF.. and really talk about how blending your households is going to work.  Is she willing and able to give her daughters responsibility and boundaries and rules?  Will she enforce them?  Will she insist her daughters respectfully comply? 

TBH.. you have already seen she really doesn't intend to.  Likely the only reason she isn't gone is financial.

It's a hard situation.. and a good reason for people to move slowly on cohabitating when kids are part of the equation.  If she doesn't see the importance/value of your rules.. expect your GF's kids to behave accordingly.

These kids have lived all of their lives without rules and you come into their lives and you think the transition for them to do chores will be easy? Your GF should have been the one implementing the change and with all that it would be difficult because she's never done it with them to begin with. To break these kids into a new habit is going to be hard and if you have an unsupportive partner you stand no chance in h@ll. She was fine with it at first but is showing resistance. I would consider moving out, continue dating and have nothing to do with parenting these girls. They are already set in their ways with a mother who could care less if they do chores and grow up to be independent functioning women.

How do I address this?

They move back out, having them move in was a mistake.

I assume that you knew that the daughters were lazy and had no rules. Did you really think you were going to change the status quo without any pushback? If your GF wanted to give them rules and chores, she would have raised them with such. Even if she were to start now, they would know where it's coming from and it's not her.

Classic example of thinking (incorrectly) that "things will change once we"... live together, get married, have a baby, whatever the case may be.

Your GF is who she is, and that is a permissive parent.

kids break them and GF does nothing !!!   This is the best time in a relationship.  You’re is going really bad.   GF should move out with her kids.   This relationship is not going to work 

They've had absolutely no rules growing up and haven't had to lift a finger.

 I'll give a month to relax and get settled and finish school 

I'm setting rules and chores.

I finally sent out chore list 

+++++++++++++++++++++++++++++++++++++

First mistake was thinking that YOU could fix years of bad parenting.  Second was that YOU are the one that told the girls all of the above.  I can only imagine how teen girls took that.  Actually I can tell you exactly how they took it.  They took it as a challenge.  Lol

My advice will be different than most on here.  One...stop parenting her children or telling them what they have to do.  That is not your job. 

Tell your SO what you expect.  If they make a mess and do not clean it up, just tell your SO the following…”hey honey…kitchen is a mess and I need to make me a sandwich, can you get that taken care of?”  “hey babe…there is soda and ketchup all over the couch, can you take care of that? I bought it at Macys incase the stains do not come out and you need to replace it.”

Weather you like it or not, you are living with 2 TEEN GIRLS.  They are the worst people in the world.  And now you have put your SO on the defensive about her girls so she is trying her best to “shield” them from you.  You need to become the friendly Uncle.  No more and no less. 

So why is she your girlfriend?

There is nothing remotely appealing or redeeming about someone who is this much of a waste of skin abject failure as a parent. There is nearly always a critical character flaw in these people.

IMHO of course.

Sounds reasonable and something I would do and say,

As usual the problem here is your partner, I've felt the same. even my dad noticed the other day that one of the SK's does nothing unless asked / pestered. I've been waiting for my partner to create some kind of chore list to do, which by the way isn't some prison kind of rules or asking too much but has it happened. No...She would rather get annoyed at me for not emptying the dishwasher than having to fight with one of her daughters.

You are fighting a losing battle unless you do it yourself and then you face the wrath of the SK's and your partner.

My advice. Give up, don't clean up after them, live in a mess unless your partner cleans up and gets so annoyed with them that she has a word and if  she turns it on you, direct her to her own children who are very capable. This way requires a lot of biting your tongue and sitting back and saying nothing. Easier said than done though.