From what I have experienced in my life, I feel we can broadly classify our friends/relatives into three types in terms of how they treat us.
Some friends/relatives treat us like a staple food. They genuinely love us and keep touch with us all the time, even when there is no need to do the same.
Some friends/relatives treat us like an essential commodity. They might not love us that much, but still keep touch with us as they feel they might need us anytime for their own interest.
And then there r some friends/relatives who treat us like a medicine. They will look for us only when they need us, and will never bother to keep touch when they have no need to do the same.