My Best Friend Gave Birth to a Baby, and the Biological Father Is My Dad.

My best friend is pregnant, and I'm very concerned about it. Her parents died when she was young, and her life experience was poor. On the day of delivery, I bought a lot of maternity and baby supplies and went to the hospital to visit her. But I didn't expect to see my dad in the ward! Could it be that... My best friend's child is my father's? ?