How do you deal with the idea of having a smaller family and fewer relatives as a child of older parents?

How can someone learn to let go of people without feeling like they're giving up on love or without feeling guilt?
What are some ways to appreciate the present moment so you won't miss these days in the future?
What are the signs that you're losing touch with reality in a relationship, and how can you avoid it?
How would you react if your child decided to make amends with someone without you knowing?