Love them and treat them with kindness.
My sperm donor (AKA father) beat me every day of my life to the point that I started sleeping with a loaded rifle when I was 12, until he finally died when I was 18. My egg donor (AKA mother) got her kicks reminding me every day how worthless I am, how stupid I am, and that she wished she had aborted me. The rest of my bloodline, on both sides, joined in for the "fun" as well. My brother and sister however, walked on water. Social situations (school for example) were the same. Abuse (physical, verbal, emotional) was the daily norm for me. I grew up thinking that it was normal and that's just how the world works. I never had one single friend my entire childhood and on into adulthood. I finally mad a friend and we became closer than sisters. We're not lesbians, not that there's anything wrong with that. We actually live together, and I refer to her as "my girl" all the time. When we met and I saw her family love each other, I told her for years that her family was weird. I had never seen anything like that before.
The only person that treated me with any kindness and love was my paternal grandmother. But she never knew the meaning of the word hate. She was the kindest most loving person that ever lived. She would rival any loving god you can think of.
So just love them, and remind them that they have value. Never tear them down. Instead build them up. Encourage them. Don't let them turn out like me. I get pleasure of watching others get hurt, and go through the most extreme pain most can't even fathom.