Some parents use the subtle-hint approach. They'll put a book in the child's backpack or leave a note on her bed reminding the child that she is loved. It doesn't have to be anything long or complex, just an expression of care and love. In the end, of course, it's God who will change a child's heart. Parents can only be faithful and know that God is in control.
Patience is essential.
It might take a good year of reconnecting before the family feels like they're through the crisis. None of you are the same people you were before. There's also a big difference between forgiveness and reconciliation. You can forgive, but the other person doesn't have to do anything about it. Reconciliation means both people reach out.