Welcome to Wikitree!
With a little more information, maybe we can help you get started. If you're trying to build your family tree beginning with your parents or grandparents, can you give us the first and last names if you know them?
For example, there are a David and Dana Maxwell living in Dallas, Texas, on the 1930 census, but those might not be the right Maxwells. (They have children with names like Dimple and Dorothy and Dixie, and David Jr.)
But if those sound like the wrong names, it will be easier if you can give us the names or any information that you do know. Did you hear any stories about where the Maxwells were possibly from before they came to Dallas?