I have 16 grandchildren with #17 on the way. Despite my best intentions it is physically and financially impossible to attend everyone's birthday every year. Although I love them dearly, Gramma and Grampa do have a life and we do make plans that sometimes conflict with plans our children and grandchildren make. (one of them was born on our anniversary!) We do the best we can to make sure they all get phone calls, cards, gifts/money, and we try to do something with each one at least once a year....hopefully the parents will understand.