My ex MIL was stingy with xmas dinner portions, but only for me! She had 3 sons, all with partners, including me, but I was not the favourite. I was also tiny, so definitely wasn't her trying to make me lose weight, lol.
I do remember after every single meal she'd cooked when there was extra, it would be offered to all her Ds's first, then the other 2 DIL's and then me. The DS's ALL took extra though, even though they had had large platefuls already.
Dessert was never offered to me, only to the men and then if any left to the other DILs.
The best time was when BIL's friend and his DW came to visit and we all went round to MILs
They were BBQing and it was taking ages and I was starving. Also I was pregnant. When food was ready MIL announced to the men to grab a plate, and then said to BIL's friends wife, oh you'd better get in quick my love, as you're pregant, you must be hungry. At first I thought she meant me, but when I got up she said , not YOU bookworm, the men and guests have to eat first.
The other woman was indeed 12 weeks pregnant. I was 8 months pregnant. It was baffling.
I found my voice after that and refused to go there for any more meals.