 And it's normal for grandparents to be excited when their first grandchild comes along and to be there to spend money on gifts or essential things like diapers and clothes. But once grandkids three and four arrive, if you keep up those spending habits, it's going to lead to a lot of money out of your nest egg. So remember, you can be generous to your family without going overboard in a way that jeopardizes your financial strategy.