making grandma cry

I called my grandparents today to wish my grandpa a happy birthday (it was on Saturday). Well, my grandma answered the phone and was so happy to hear from me she started to cry! I didn't know at the time, but she handed me off to grandpa and then he hung up. So I called this evening to talk to grandma (I didn't want to seem rude by calling right back). She told me she was crying on the phone and was sorry she got so emotional. I had no idea, but then realized I guess I need to call my grandparents on a regular basis. I just forget to call people with school. Now everyone is going to think I'm a horrible person, first the story about my brother and now about how I never call my grandparents. I do love them, my family is just dysfunctional and I'm trying to learn how to be a better grandson... one day at a time. One day at a time.