The background: DH has 3 siblings who live nearby. MIL died a few years ago, so FIL lives alone in the house DH grew up in. They describe themselves as "very close" and have always gone to FIL's twice a week for dinner (just the siblings and their kids, not partners). When MIL was alive, she cooked; since her death, they take it in turns to cook, so DH cooks once every other week. This costs about £25 each time, so about £50 per month.
FIL has recently retired. He has absolutely no savings (MIL was a HUGE spender and just spent it all), and gets only a state pension. He's realised that he can't afford to pay for all the bills. The house has 6 bedrooms, so it's huge, expensive Council tax, expensive to heat etc.
In my head, the solution is that he needs to move somewhere smaller and more manageable. However, DH & siblings are not in favour of this because then they wouldn't be able to go round all at once, certainly not twice a week.
His brother has suggested that they all chip in each month to cover the bills - about £50 each. So including the cost of cooking once a fortnight, we'd be forking out about £100 a month for this.
We could afford it, but we'd be sacrificing other things. For instance, we'd like to move to a bigger house (the kids would love some outdoor space). But that would be very tight financially if we had this extra money to pay each month. We'd also like to start saving some money for the kids each month too - £25 each would build up to a decent amount.
DH agrees with me in principle, but is being put under pressure by his siblings. He said he'd feel bad continuing to go to dinner twice a week if he wasn't paying his share. But he also doesn't want FIL to have to move, thereby possibly meaning that they can no longer all visit together.
There was a vague suggestion at one stage that if FIL didn't have enough space, they'd all take it in turns to go round each others' houses, so we'd host every other week. This won't work because both me and one of the other siblings partners work from home and it would be too disruptive (and anyway, I don't really want a big crowd of people in the house once a fortnight). Again, I feel like I'm getting in the way of the plans.
Any suggestions? Is it unfair of me to say no to us paying money to FIL each month? Or is it reasonable to expect him to live within his means, even if that means moving house?