Nope. I'm not people-oriented or photo-oriented.
I suspect that in TV/movies it's a visual shortcut to say "This character has (or had) a family; they're a family type of person and have strong connections to these other people." It also helps give the perception that this character is connected to other people, maybe their community, etc; they don't exist in isolation. (And also that, in theory, there is a community/network/family of other characters just offstage.)
More extreme variants are the "carry my family's photo in my wallet" type, and the "take a small framed photo of my family with me if I stay in a hotel" type. It reinforces that gosh darn, this character is REALLY strongly linked to their family; it's really important to them.