I've been researching the topic of grandparents' visitation rights. Here's the first thing I've learned. The laws are different in every state, although governed to some degree by the U.S. Supreme Court case Troxel v. Granville. Here's the second thing I've learned. If you have a grandchild in any situation other than an intact, happy, harmonious family, think ahead. The day could come when you have to prove that seeing your grandchild is in his or her best interest. If that day comes, showing that you have a pre-existing relationship with that grandchild could be important. Every time you see your grandchild, write it down on your calendar. Every time you buy a pair of pajamas, keep the receipt. Take photographs. Save ticket stubs. Send e-mails and save them. Chances are that you'll never need this documentation that you are an involved, caring grandparent with a preexisting relationship with your grandchild. Then again, if you need it, you'll have it. The bad news is that there are thousands of grandparents who can't see their grandchildren who wish that they could. The good news is that with some luck and some foresight, you don't have to be one of them.