This will be long! And I've namechanged as this could be quite outing. I've been around years though, honest
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My DB's world fell apart last year when his wife and partner of 20 years told him that she had been having affair and wanted a divorce. They have a DD 13, and a DS 17. He moved out with the DC's (their choice) to our DM's house. His DD saw his mum a little straight away, his DS took a few months as he was so angry with his mum, but now sees her fairly regularly. My DB let his children take the lead in this, as he should.
My SIL chose to be a SAHM for many years, only recently getting a part time job. So my DB provided financially which he was of course happy to do, as they were a team. But she would regularly have a go at him for not earning enough, make financial choices that were beyond their means etc. She took on her job reluctantly, as DB said that if she wanted to spend more she had to earn it, as he couldn't earn any more than he did. Sounds fair enough to me? My DB had a house when they got together, which she did not contribute to financially. They moved two years ago, to a bigger house paid for by the sale of the old one (owned outright) and a mortgage paid for by my DB.
This house is now being sold, and the profit will be split 50/50. However, my SIL keeps demanding more, as she wants to buy a property in a specific area which she could not afford with the initial money she will get. At present, my DB is paying all the running costs of their current house plus her car loan etc as she only has minimum income of her own. But she keeps asking for more.
Their DD is spending 50/50 time with DB/SIL at the moment. DD is happy with this. But SIL is now demanding it change to 80/20 as she thinks this is fairer. She has started to make promises to DD about what she will get if she agrees to the change, and DD is starting to turn. This is devastating DB, as he has tried his hardest to be as neutral as he can be about SIL in front of the DC's, and his DC's are his life. He believes now that SIL is angling for maintenance, but can't vocalise this as it's a horrible thought so he just dare not even suggest it.
I don't see DB often as I live 3hrs away, and he's not one for long phone conversations. I saw him on Saturday for the first time in a while, and he looks broken. He just wants the whole thing sorted. But SIL keeps moving the goalposts, and saying that he is the awful one for not giving in. His funds are now really limited, so he's really reluctant to pay for lawyers / mediation etc. In theory, it should be so simple. House proceeds 50/50, DC's time split 50/50. But she just will not let this happen. She believes he owes her so much more. But I just don't see how he could? I'm unlikely to ever see her again. My DM is trying to stay out of it other than being emotional support for DB, but SIL has taken her anger out on her several times as she blames her for the DC's not wanting to spend as much time with SIL as she thinks they should.
My DB is a lovely,kind straightforward man who just wants to get on with things