Is it permissible to pray behind a muezzin who brought a Christian woman of the People of the Book to his home with the intention of inviting her to Islam, but it is not yet clear whether she has converted to Islam?

If the Christian woman is the son's wife through a legitimate marriage, then there is no objection to her residing there, and it is obligatory to help guide her to Islam. However, if she is not his wife, then it is not permissible for her to reside there or to be in seclusion with the son. In this case, it is obligatory either for the son to marry her if she is chaste, or to expel her and prevent the son from contacting her. In any case, abandoning congregational prayer is not permissible for this reason.