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Under Texas law if you have lived with someone for two or more years and you introduce that person as your wife you are by common law married.
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This site says that you have to also file a joint tax return with the common law spouse to have a commom law marriage:

http://www.nolo.com/article.cfm/objectId/709FAEE4-ABEA-4E17-BA34836388313A3C/catID/3C3AF4CE-DB9E-48C4-8DFCFE2E47C91747/118/304/145/FAQ/

I doubt if they would have been doing that, or even claiming all of the kids as dependents. So all they have is multiple cases of statutory rape, if the girl was young enough. The problem here though is that, again, we see the law trying to change the perception of something, in the public eye, by assigning to it a peculiarly pejorative name when the object is to stir up hatred of the "rapist" ("statutory rape" when there is no force involved and the rape, if any, may even have taken place in the opposite direction to that assumed) or an admirable name when it is desired to stir up support for those wishing to use law to commit theft ("equitable" property division, "community" property).

Any way you slice it, then, the State of Texas is tearing apart voluntarily formed, loving families who wish to stay together, based upon some arbitrary and demagoguery-soaked law pertaining to age. I have seen extremely young girls who are mature enough to be responsible mothers and I have seen much older women who can't even take care of themselves.