Does your child call someone “aunt/uncle” even though they’re not blood related?

So I live 1,500 miles away from my blood relatives. For a reason. I live in Tennessee & my blood relatives live in Maine. My blood relatives are toxic people & I just didn’t want to be around that.

We had friends that lived in Tennessee, my sisters ex husbands family. They’re more like family to us than our actual family so we came down here.

Now, there’s my TN mom & she has 4 daughters & 1 son (my ex brother in law); all of them have kids so there’s 12 grandchildren total including my 16 month old daughter. My daughter calls my TN mom “grandma” & all of my TN sisters “Aunty ___” & my ex brother in law is “Uncle ___”. The rest of the 11 grandchildren are her cousins & we call them that (4 of the kids are my sisters children & are actually blood related).

I had posted a picture of my daughter with my TN mom on Mother’s Day giving her the present we had gotten her (I also mailed a present to my birth mom in Maine) with the caption “spending Mother’s Day at Grandma’s!” After that post I had one of my blood relatives message me the other day talking about how it’s inappropriate for my daughter to be calling them family titles because they’re not blood related.

I don’t see anything wrong with it?? I grew up calling my moms best friend “Aunt ___”. What’s the big deal?!