MIL comparing Daughter to her family

[namesall]

So my 3 year old Daughter looks just like her Dad's side of the family. It's all I heard from my MIL when she was born. It p*ssed me off but couldn't really argue as it was true.

She hasn't mentioned it for a couple of years, and I've just had another baby that is my double. Suddenly that's all she's talking about is how the eldest one looks like her side, her personality is just like her Daughter, the way she sits (yes, really) is just like her uncle from about 100 years ago (not even sure how she would know how he sat & she was literally just sitting like a normal kid).

She will say "oh does anyone in your family have really long, toned legs", I'll just look at her a bit confused and then she'll say "oh well her Dad had legs exactly like that when he was younger".

She points out really normal stuff that no one would ever think of comparing. Why would anyone do this?! She is driving me up the wall!!!

I’m a bit confused. Would you think it was normal if she was comparing her to your side of the family?

Personally if an inlaw told me ‘oh, look, your dc looks just like your second cousin/aunt/whatever’ I’d think they were certifiable.

Children are a mix of both their biological families, and I think it’s normal that each family would see the similarities with those on their side, which are after all the ones they actually know best...