Sorry to hear it. Disagreement over money is unfortunately a big cause of family strife.
It sure is. It's been going on for YEARS. When I was a kid, in the 80s, my dad would not allow her to have a joint checking account with him. She had her own account and he'd write her a check once a week. She always complained that the amount ($150 in 1986 dollars; $407 in today's dollars; that's WEEKLY) wasn't enough. I can sort of guess what happened that lead my dad to conclude that a joint checking account was not a good idea...
Her latest grand idea is that she can use the extra COLA increase in her SS payments to get herself a new car.