I know there is a common posibility of a child growing into a different path from their parents. I am even okay with them disagreing on political/religious views with them or just not getting along, as long as they are good people and they don`t harm themselves and others. Of course not getting along may make it more difficult to become close.
If they harm others because of a mental illness like schizofrenia, i would be concerned for their mental health and do my best to treat that condition, and i would do my best to protect others from them.
If they become selfish and terrible people, it would be way harder to love them, but i would try to teach them to be better people, and i would protect others from them.
ex: if i have a son that beats up his girlfriend, i would try to help said girlfriend to get out of that relationship.
and if said son becomes a dangerous criminal and i get proof of that, i would help to get them in jail.
If i lose hope of them changing to the best, i don`t know what would i do.