Is a wife's cutting ties with her family, who doubt the Prophetic Sunnah and claim that the Prophet does not have the right to legislate, considered a severance of kinship ties, and is it permissible for the wife to obey her husband in boycotting them, or must she maintain ties with them?

Regarding the Qur'aniyyun, their ruling and the invalidity of their methodology have been previously explained. It is permissible to sever ties of kinship with them if that constitutes a repudiation of their misleading innovation, especially if there is a concern that the wife might be swayed by them. Scholars have explicitly stated the permissibility of shunning an innovator until he repents, and the permissibility of shunning anyone whose harm to one's religion or worldly life is feared. Nevertheless, the questioner should exert effort in advising them.