Another MIL thread sorry.
My MIL has two grandsons, with mine being the younger by 7 months.
She insists on saying my son is 'behind' her DD's son. She doesn't mean behind in terms of hitting milestones later (he generally has hit them earlier fwiw) she means he doesn't do the same things that the older child does.
AIBU in being irritated by having my ds described as behind, when he is simply younger? Because I am blimming irritated.