Is the change in a husband's behavior—from aversion towards his wife and daughter to renewed love, along with his family's interference—a result of magic (sihr)? And how can it be treated, despite the fact that he does not recite the Qur'an?

It cannot be definitively stated that the cause of the dispute is magic (sihr). The cure for magic is made easy by maintaining regular remembrance of Allah (dhikr) and lawful incantations (ruqyah (definition) shari'ah), along with reliance upon Allah. It is advisable to communicate with the husband to understand the reason for his abandonment. If this is not possible, then wise individuals should intervene to reconcile between you. It is also recommended to frequently engage in dhikr and persist in supplication (du'a).