You don't. This is not your business. But if you have a good relationship with the son, then you can encourage him to tell his parents.
You can not tell if someone is gay. The only way to know for sure is if they tell you.
If you are also gay, then tell your friend. If you are the opposite gender, then move on.
You can not tell if someone is gay by wrestling with them. The only way to know for sure is if they would choose to tell you they are gay. It should not matter anyway, especially if they are your friend, you should accept them for who they are.
It's a good bet that your son is gay, but he could also be hiding the pictures for a gay friend. Give him space and let him come to you.
you ask him.
Tell him you are uncomfortable with that.
if it is a boy he is gay but worry tell your other friend
Ask him
If your son tells you he is gay, whether it's a surprise or not, just tell him you love him and accept him for who he is.
If you are gay, no if not Yes
flirt with her then be bestfriends, then tell her!... to be her best friend act gay! ahha jk
No.... You can never be sure if anyone is really gay... unless they tell you themselves.