I need to clarify a few points. Sorry if my posts have led to more confusion than necessary.
First as it stands now *neither* have legal custody, temp or otherwise. The current arrangement was due to circumstances, namely, OW was a "friend" of DD's and they were helping her out by letting her and her son stay with them. stbxSIL (I'll call him J just to make things easier) and OW started their EA/PA which understandably made the situation intolerable to DD. Yes she may have been too hasty in her decision to leave but it was her choice. She came to live with us and we just did not have the room for her *and* the kids. If we had, the situation would be very different.
Second, it's natural to assume that since J has the kids, he is their primary caregiver. That point can be debated. If he's following his usual pattern, that responsibility has been handed over to his aunt. He did this with us, with my sister and with his mother. His attitude seems to be "It's your house so my kids are *your* responsibility." When he tried it with us, H called him on it. Actually called both of them on it as DD was taking advantage of the situation as well. However, DD started stepping up to the plate. J on the other hand got pissed. Like how DARE my H expect him to take care of his own kids?
J is very good at blameshifting and playing the victim. Everyone who has taken them in has also asked (or told) them to leave mainly because of J's attitude. When my sister had had enough of it my DD apologized to her. My sister wouldn't have minded so much if J had just stepped up and been a parent instead of expecting my sister to do it. Same with us.
As for his employment history, I know of at least two jobs he could have kept but didn't. One was at a landscaping place and he "had" to quit. Why? Because in his mind, he wasn't getting the preferential treatment he felt he deserved. He was the new guy and it was a family-owned business. The second was where I work. He got fired for punching someone. Was it his fault? According to J, nope, it wasn't. The guy had made an insensitive, even mean comment about DD so J punched him. BUT, according to J, this guy got him fired.
When they've been asked to leave by whoever they've been staying with, his attitude is in no way at fault, by his logic. It's *their* fault because they have a problem with it and he shouldn't be expected to adjust it. Like I said, typical unremorseful wayward bullcrap. I see it clearly because I indulged in it myself once upon a time. No doubt he blames DD entirely for his EA/PA which BTW resulted in an OC.
As far as visitation, he decided when and how long DD could see them because he knew she didn't have access to reliable transportation. Yes, we have a vehicle but it's not exactly top-of-the-line, straight off the showroom floor. It's a 20 year old van with not so minor issues. H puts 140 miles/week on it just taking me to work (I ride the bus home) and there were serious concerns about it being able to make at least a 100 mile round trip on a regular basis. J knew this and took advantage of it. And after a while it became obvious (to me at least) that he wouldn't bring the kids unless he got something out of it. He usually asked (demanded?) gas money in return. No real problem. What's a tank of gas to being able to spend time with the grandkids? The main problem, again, was his attitude and the implication that he shouldn't even be asked to absorb some of the cost of transportation. By asking gas money, he put me and H on the spot. I doubt his bringing the kids was done out of the kindness of his heart or because he acknowledged that the kids would like to or need to see their mother.
HIOI, I do believe that's the problem with the school issue. They're separated but neither has court ordered custody. Neither is recognized (legally) as primary caregiver and the school evidently requires such documentation.
Holly, yes the kids are being used as pawns but not, I think, by DD. While I don't think J would mistreat them he *would* use them to get what he wants. He's used them before when trying to play the guilt card. I can definately see him using them to get back at DD. After all, he has an A, she moved on and he's pissed about that. We've both seen this scenario here on SI. WS chooses the AP but fully expects the BS to wait for them in case they change their minds. When the BS doesn't, they get vengeful and will use anything or anyone, including kids, to "get even". This is what I'm convinced J is doing at least in part.
On DD's part, she wants the kids because they're her kids, not because she wants to "win". She loves those kids. I know she stepped up to the plate when H called her on it. While she was here and had the kids *she* was the parent. She made sure they were fed, she was the one who bathed them, dressed them and put them to bed. Yes, I helped, usually right after bath time and the ocassional diaper change but most grandmothers will. If they did something they knew they shouldn't, she was the one who called them on it. And she made sure they knew that it was Papaw's and Mamaw's house so it was our rules. J's attitude was "Your house, not my problem."
Sorry this turned into a novel of sorts but I wanted to give a more complete picture and clarify a few points.