The churches ignore any scripture that would inconvenience their members.

But Jesus told him, “Let the spiritually dead bury their own dead! Your duty is to go and preach about the Kingdom of God.”

As Jesus was speaking to the crowd, his mother and brothers stood outside, asking to speak to him. Someone told Jesus, “Your mother and your brothers are standing outside, and they want to speak to you.” Jesus asked, “Who is my mother? Who are my brothers?” Then he pointed to his disciples and said, “Look, these are my mother and brothers. Anyone who does the will of my Father in heaven is my brother and sister and mother!”

Now, your specific duty (probably) isn't to go be a travelling preacher, and you aren't Jesus himself, but the point is clear: You should not to let errant family members drag you down into their own bad behavior or distract you from the good things that you need to be doing, whatever they are.

Blood creates a bond, but subsequent actions can sever it.