SIL is not a skid but similar behavior
So I have a SIL who is in her 30s and left her husband about a year ago. She apparently has a long history of being financially irresponsible and leaving others, particularly her parents to clean up the mess for her. MIL enables it and complains but is obviously also loving being the enabler because she likes having her kids depend on her still and being over involved and "important" in their lives.
FIL and MIL borrowed SIL thousands of dollars to help her get an attorney for her divorce. SIL is now making a good income and getting a large amount of child support and is completely able to be financially stable. But she told her parents all about her plans for her 8k tax refund, none of which includes paying them back like she said she would. On top of that she stopped paying student loans for the second time that her parents cosigned and inlaws are paying that for her now too. On Christmas she didnt buy anyone gifts, which is perfectly fine except for the big show she made of telling our kids that she couldn't afford to buy them anything and then having her kids open all of their gifts from everyone in front of them and then didnt even have her kids tell us thank you for the gifts we got them. I guess if it was me personally I would have messaged my brother and said hey let's not do a gift exchange this year or let's do small gifts instead, but it was obvious she really wanted to emphasize and let everyone know that she couldn't afford anything. She loudly told my 8 year old that she didnt have any money and couldn't buy gifts when he didnt even ask and it was weird. Also I probably would have waited til others were gone to have my kids open gifts from relatives who weren't there and myself so that they weren't opening gift after gift in front of their cousins who only had a couple to open from the grandparents.
Anyway, the point of this is it reminds me alot of some of the adult skid behaviors I see on here. In a way it also makes me feel better to know that "normal" families have issues too and life wouldnt necessarily be wonderful if I had went a different route and had a nuclear family instead.