I was staying at the in laws over Christmas and got confused over this and wondered if others could help.
MIL kept telling me just to sit down at breakfast and then commented 'oh she is sitting waiting for her breakfast'. I had offered to help her and with the dishes and did do quite a bit over the time there.
She doesn't comment on DH and the DC 'sitting there' and it feels a bit like a jibe.
Also, she then commented that DH was 'like a waiter' as he asked if I wanted coffee and brought me some. But I would feel a bit odd going off to get coffee in their house.