I have this rule for myself. Whenever I think of a loved one, I try to call them if even just for a few minutes because I often think about the reality that I will likely be attending the funerals of many of the people I now love. Last Thanksgiving when my grandmother introduced me to a friend, she said, "This is the one I told you about. He's the only grandchild who ever calls me."
She doesn't say it in a way that sounds complaining.
Usually when I call she says, "I was just thinking of you this morning!" She thinks we have some sort of psychic link, which I allow her to believe.