How would you heal the heart of a rejected child"?

Lets say you (or friend) falls for someone whom their parent rejected. So that child is very hurt. How would you heal their heart so theyt learn to love.. when that was not modeled for them.

Was thinking about this in context of wars... soldiers go around and mate with women, but may reject the women, child and culture. They are left with these children. This happened many times in history, such children have loss of father figure, love of father, maybe even mother.

How would you heal the heart of a rejected child?
How would you heal the heart of a rejected child"?
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