There are many excellent websites that cover all areas of family law in Texas.
The Houston Bar Association has an excellent free booklet available on-line.
Just "google" Houston Bar Association and locate their booklets under "for the public".
It's approx. 40 pages so you might not want to print it.
The Houston Bar Association also has booklets on other topics of interest to Texans - in English, Spanish and Vietnamese.
If you want to do research, please stick to Texas websites.
Family law differs from state-to-state. Each state is free to write their laws anyway they want. If you live in Texas, you really don't care about the laws of Delaware, Louisiana or Nebraska!