My older sister is my favorite person on the planet, by far.
My older sister and I are friendly, but I do not count her as a “friend”. A close acquaintance, maybe. She watches my kiddo sometimes, and we can have a reasonable conversation about random things (in a group, say at a family party). However, she and I don’t have any similar interests but one, never hang out for any particular reason, and we don’t seek out each other’s opinion on really anything.
You let close acquaintances watch your kiddo?
Maybe he only considers his kid to be a close acquaintance.