Am I'm wrong for feelings this way.

Okay, so I've been in a relationship with an older man for over 10 years now. And I believe his son is gay, Dont get me wrong I dont think there's nothing wrong with being gay. I just don't like for people to be in the closet, though I can understand the reason for him, his mom is super religious. Their son is 30 years old and still lives with his mom. I've never seen him or heard about him being with a woman. And there's something about his eyes I can't explain it, but I just have a strong sense of people and I just know he is. But I can not tell his dad my suspicion, because he his also somewhat religious and wouldn't understand.