We have been asking our landlord to repair our roof for about 3 months because water is just pouring through our ceiling and last night our ceiling co

You need to follow the rules under the Texas Property Code regarding providing written notice of repair. To make life easier on you, you should provide such notice by certified mail, return receipt requested. If you need asssistance, or the work is not being completed, then you will probably contact an attorney. You do not want attempt the "deduct and repair" option without speaking to an attorney first. It rarely works the way tenants would like, and they are sometimes left with an eviction.