How is that principially different from your granny worrying about breaking hips? You can play catch with your brother who is 15 years older and your sister wh

How is that principially different from your granny worrying about breaking hips? You can play catch with your brother who is 15 years older and your sister who is 30 years older will haul you around. Grannies raise children just fine, and if the family is complete they can do it indefinitely.