
I understood why people would find it weird that Creed called Navia sister. I think it's fair. I grew up with that kind of culture so it's not too weird for me. When I called random people (older/younger) brother or sister it's more of a out of respect or familiarity. Where I'm from, it's common for some couple who even have just 1 years age gap would still refer the older partner as brother/sister.
Noooooooooooo.