"I haven't been able to spend much time with him as his mother would not allow it."

Correction: "I haven't been able to spend much time with him as his father would not tell his ex to bugger off and stop trying to control his household. This is a failing of my boyfriend."

"He has absolutely no manners or respect."

Correction: "The child's parents, including my boyfriend, have failed to step up as parents and teach their son manners and respect. My boyfriend does not need his ex's permission to do this, and as he is the one I am in a relationship with, he is also failing me (and his son) in this way."

" but if I bring it up he gets upset and says there is nothing wrong with the way his kid has been raised."

BIG.RED.FLAG!!

Here is a compilation from my own observations:

1. Does your man allow co-sleeping with his children? (aka the kiddies routinely jump into bed with him at night)

2. Does he have to lie down with them to get them to sleep?

3. Do the children seem somehow "stunted" socially? Do they have poor hygiene habits, eating habits, bedtime habits?

4. Does your man subscribe to the "one big happy family" model? (expects you to love his children as much as or more than him)

5. Does your man have the "inability" to say no to his children?

6. Do his children seem overly "hyperactive" to you?

7. Does your man say "just relax; you worry too much" or "Everything will be just fine" if you bring up a legitimate concern

8. Do the children seem "overly needy" demanding that dad spend 24/7 with them? Do they physically lay all over him and go bonkers when daddy steps out of their peripheral vision?

9. Are they unable to do age appropriate tasks or want dad to do things that could easily be done themselves?

10. Does dad seem overprotective of his children; unwilling to let them try things out on their own?

11. Has dad said things like "I don't want to make waves with the BM b/c it will affect the children" or "we'll take the high road" when faced with blatant BM stepping over boundaries.

12. Has dad said things to you like "you don't like my children" or "my children are UNCOMFORTABLE with you" or "you're a child hater" or "my children are afraid of you" or "my children don't like you?" This is code for you are able to see through the manipulation and the children don't like it. . . and frankly he doesn't like the fact that you can see through his children's manipulation either. He'd rather look the other way as opposed to actually parenting because he might "lose" his children to the (almost always) PASinator BM.

If you can answer YES to ANY of these questions, get your sneakers ready to go.

Do you know your man's FINANCIAL situation? Do you know if he has massive left over marital debt? How high is his CS obligation? Have you seen the divorce decree or mediation agreement. Does it seem overly slanted in BM's favour?

Love and "understanding" simply does not cover it all. Especially in the case of stepmom is supposed to be "understanding" when all of her money goes to household expenses b/c almost all of biodad's money goes to CS.

How long would you be willing to float biodad should he lose a job and have massive CS obligations?

There are many other considerations as this type of relationship is not to be taken lightly.