Don't Believe Everything in the Census!

When I was looking for my husband's ancestors, I found them in the census, already married and with children. The oldest child, according to that census was born in New Jersey. So I started searching in New Jersey, hoping to find not only the birth record but also the marriage of the couple. Well, I didn't find either the birth nor the marriage. Later, in a subsequent census record, in researching for the daughter, married to my husband's ancestor, I found the mother living with her. Much later, I found Edward Johnson married to Matilda Johnston in New York, not in New Jersey! And what confusion I came across with their last names.