Background - dh comes from another country where you can be put in prison for debt. SIL is a dysfunctional/waster/liar/manipulator who has repeatedly run up large debts often on her family's credit cards and expects to be helped out. In dh's culture giving money to family members is expected, especially when one of them (dh) lives in the West and is therefore rich.
This time against dh's explicit instructions SIL has spent the equivalent of 6 grand on house improvements with not a penny to rub together of her own. Of course she expects dh to pay
We are not rich and have debts of our own that we are managing. This is a whopping great lump of money for us that we cannot afford (and don't bloody want) to give.
But if we don't at least try to help pay SIL could go to prison and she has 2 children (with no father). Dh will never be able to see his family on good terms again and the rest of dh's family will be left to foot the bill (the rest are lovely sensible but not rich either).
Tbh we could afford to give some from an inheritance I got last year but the money we had put down for our own children's future. If we give it away they lose out. Also dh told her before she did this that he had no money this year and wouldn't be able to help if she overspent. If we give her anything she will just keep on spending and spending our money to fund her lazy fat arse not working. If we don't dh's lovely innocent nieces lose out.
Oh what the f~~k would you do?