What should I do about someone in my house who disobeys God?

It is obligatory for whoever sees an evil to change it according to their ability. Thus, the questioner must condemn the perpetrator of the sin in her house, advise him, and remind him of Allah. If he does not desist and it is possible to expel him without a greater evil resulting, then she should do so. If none of that is possible, then it is obligatory to condemn it with the heart and not assist in it.