I’d have happily moved in next door to my late MIL - she was the mum I never had. I love my FIL but he is very hard work, so,I wouldn’t want to live next door to him.
From dh’s point of view - I think that, if my dad hadn’t died years ago, he’d have been happy to have him live next door, but we both find my mum a very difficult character, and 390 miles is about the right distance between us.