Brief history.
MIL, SIL (we are married to MIL's 2 sons) and I have a long standing tradition that on our birthday we 3 go out for dinner adn the other 2 pay half the bill so in effect birthday person gets a treat. Have done this for years. We do this is addittion to buying each other a small gift.
Earlier in the year it was SIL's bday. MIL had loads of wine and announced she was paying the whole bill and treated SIL and I. Very kind of her.
Then it was MIL's bday, SIL and I paid.
Then it was my bday. SIL rang MIL to say she was unhappy paying towards my meal as I paid nothing towards hers as MIL paid teh whole bill. MIL can't afford tp pay more so it is suggessted that we now split the bill 3 ways.
I am thinking, you know what? This is suposed to be a fun nice thing we do for each other, and this isn't fun so lets not bother.
WWYD?