The law of averages

It seems that it would stand to reason that if there are a high number of grandchildren, there would be a cooresponding high number of broken bones... one grandson just had his cast removed from his broken leg and now this little fellow has a boot on his foot from breaking two bones in his foot. (He was playing by himself in the playroom when he either stumbled or slipped somehow and began to cry that he hurt his foot. Just like that!)