You didn't have a relationship with your father.
You've learned from other people in your family that he treated your mother very badly before he left yall.
Your mother has never said a bad word about him simply saying that they couldn't work it out.
You've since met him and decided that you dodged a bullet by home not being involved in your life growing up.
You are now in your 40's.
You have a family, a good career and you're happy.
If you found out today that you had a half sibling...would it be important to you to get to know them?