I wish that Ancestry.com would include some basic error checking in their software. I have found some unbelievable errors present in a lot of the Public Family Trees, such as:

People with marriage dates to other persons after they are dead.

People marrying when they were less than 13 years old.

Spouses having children before they were born themselves.

Children with birth dates that would make their parents only 5-12 years old when they were born.

People need to be very careful before copying data from other folks Public Family Trees. You may turn out to be your own grandpa! LOL