If a family has a gay family member you tell that gay child that you love them very much. That will never change. You just won't accept gay behavior as normal because it isn't.
It is very painful but parents are often faced with children who have compulsions. I'm sure Jeffrey Dahmer ' s mother loved him in spite of what he did. Parents show up at jails to bail their children out of jail. They still love those children but won't accept the actions as normal. Not even if that act comes from a compulsion they cannot control.
Gay behavior is normal to a certain percentage of individuals. That makes it normal. If we are to accept what you say as being true, then we could just as easily say that being left handed is abnormal, wrong, and dangerous. Funny thing about that; the Catholic Church for centuries believed that being left handed meant a person was the servant of the Lucifer himself. They would forcibly make left handed people use their right hand. In Catholic schools, as late as the 70's, nuns would use rulers on the hands of anyone using their left hand.
Just because a behavior does not conform to your idea of normal does not make it abnormal.