Some miscellaneous observations and Good Canon Facts about the FBI Family:
JJ was the first to refer to the team as a family, Garcia and Rossi are the two that use family words the most
Reid is a similar age to Steven (Gideon’s estranged son) and Sean (Hotch’s estranged kid brother), and if Rossi’s son had lived he’d have been about that age too. It’s obvious from their relationships with Reid that Gideon, Hotch and Rossi are all aware of this fact.
Rossi considers himself “more married to this team than [he] was to three ex-wives”
Morgan once jokingly referred to Hotch and Rossi as “mom and dad”
Hotch and Emily look like they could easily be siblings
Reid doesn’t look much like Hotch, but he could very easily be mistaken for a relative of Jack’s (eg. a cousin or much older brother)
JJ and Reid could probably pass for siblings too, although that’s more in terms of behaviour than looks
Jack calls Rossi ‘Uncle Dave’
JJ’s kids call Reid (who is also their godfather) ‘Uncle Spencer’
Garcia likes to specify that she is Henry and Michael’s fairy godmother, thank you very much
Blake once said that she likes to think that if her son Ethan had lived, he’d have been a lot like Reid
Blake’s dad (who had only just met them that week) invited the whole team around for a barbecue, saying that they couldn’t have a party without “the whole family”
Shortly after Morgan’s son was born, Rossi delightedly declared that it was time for him to meet his Uncle Dave
Morgan names his son Hank Spencer Morgan, after his dad and “the best little brother anybody could ever ask for”
Garcia refers to the team going out for a meal together as “family dinner”