I've just read the thread about the MIL kicking off about a bank account for DGD, and have also been following the one about baby stuff being donated prematurely.
My own MIL has, for the last 18 years, veered, completely unexpectedly and inexplicably, between being lovely, lovable, generous and great company, to being really moody, trying to pick fights with me or subtly bully DD behind DH's back, and generally being very mean. It's like two different people! I can never predict what will bring out mentalist MIL. Don't get me wrong, she's not a patch on some of the MILzillas one reads about on here, but it is still baffling and upsetting.
Problem MILs seem to be such a frequent thing and on MN particularly. Are there any broad theories on what causes this? In my case, I used to think hormones, but that ship has long sailed. Is it just an age-old conflict, has it got worse recently, or is it worse on MN?
Genuinely curious.