Motion for Enforcement

There is no requirement in the Texas Family Code to send a demand letter for visitation, unless your Final Order requires it specifically.  If you are simply wanting someone to know they need to let you visit or you'll have no option but to take them to court, that's basically all you need to say.  Now, if you're filing an enforcement specifically, I would consult a law library - almost every county has a couple of them, at the schools or the courthouse.  The main thing is you must state with specificity which items of the decree they are violating and how, when, where, in detail - in order to prevail in court and put the other side on notice as to what they are being sued for.  The good news about an enforcement is you may get some time back with the children and/or costs and attorney's fees for their violations, should the court find they have acted contemptuously.  A local attorney is a great source to make an enforcement worthwhile.  I'm not sure in 10 years I've ever seen a pro se (someone without an attorney) attempt it.