depends on if they're doing something together on it or not.

Dude its totally valid. people that are just friends do it. you should be grateful that the father is actually there.

They were probably texting each other in a group chat. Go outside? Are you kidding? You could get killed by climate change, a Proud Boy or critical race theory.

While I understand OP’s feelings about this, not everyone has the same level of needs for personal communications. Some people (like my own wife) have a high need for talking and communicating with friends. Some people like me are a bit more introverted. For people like that, sometimes just being in the same room with the people you love or like is satisfying even if you aren’t actively engaged in conversation. OP, you cannot force people to be just like you or vice versa. You have to compromise. Don’t expect everyone to be at the same level of needing conversation as you. On the other hand even introverts should be willing and able to converse with you if you refrain from being too needy. Real life requires compromise and understanding of the others around us.