Just had a Mother's Day card in the post - from my grandmother?? 
It actually says, "MUM - wishing you a happy Mother's Day"!!!
Now don't get me wrong, it's very sweet, but now I feel bad that I didn't get her one, but if I had got her one, I would have had to get my aunt one too (we're all seeing each other on Sunday), and then if I got my aunt one, would she feel like she had to get me one, and her sister (my mum) one, and then would my mum feel bad because she should have got one for her sister... You can where this is going!
AIBU to think everyone should just stick to giving their own mothers a card, and let everyone else sort their mothers out?