Dh is on a roll salary wise and has recently had an additional windfall. Sil is having a hard time financially. He wants to give her £12k to pay off her debts. This is in addition to 10k given 6 months ago, plus a monthly 'salary'.
I know they are close, but dh is blind to the fact that he is singled out as the person she cries to when in trouble. I asked him if this would be a one off but he refused to say yes. So basically he will pay her debts for life.
The reason I think I am being unreasonable is because Dh earns the money not me and our family will not go without. He is known in his family as the one everyone leans on.