Our youngest is due to leave home next year.
ILS have no assets (ILs went bankrupt about 20 years ago) and they live in a council house now after losing their home. No reason other than they are hopeless with money and for t hemselves into loads of debt.
MIL has been complaining about her husband (DHs stepdad) for about 20 years. It comes around in full circle and whilst I acknowledge he's a pain , she has never done anything to change her situation.
Yesterday she told DH that she intends on leaving her DH but can't as she has no where to go as no assets. DH then offered for her to move in here once DS goes to university next year. 
For context, there is no abuse going on as far as I know. Her DH is just selfish and sometimes she gets fed up of it. I get that.
Im not one of these who dread the children flying the nest
. I've had it all planned, looking forward to having the house back to ourselves. .
We wanted to sell up in a few years and maybe buy somewhere smaller. We had plans to travel, lots of weekends away and want to live in a particular place for a year.
Now MIL is going to scupper all of that. Once she's here that will be it. She's 75 now , so that could be another 20 years of me looking after an elderly woman who has nowhere to go.
I just feel
. Their financial screw ups have had alot of impact on us over the years. They turn to us whenever they want money, which has been alot.
I'm hoping it won't happen , but she texted me yesterday to thank us as now she knows she can leave stepdad.
Aibu?