Change my view: it's unprofessional to have a group photo (2 or more people) as your LinkedIn avatar. Doesn't matter if the other person is your kid, SO, friend, or coworker. There's exceptions if you're the focus of the photo and other people are in the background, especially in a professional setting or if the photo represents a professional accomplishment.

If my LinkedIn avatar is me and my friends hanging out, it doesn't communicate that I value work-life balance, it means I don't pick up on social norms.