Is it obligatory to fulfill the annual vow (500 dinars) and marry, given that the vow was made in a state of extreme despair after believing that the sister had contracted AIDS, and it was later revealed that she did not, and taking into consideration the difficult financial circumstances and the approaching marriage? And is it obligatory for the sister to divorce her drug-addicted husband despite the presence of a child between them?

The question contains two parts:

1. The vow (Nahr): If the vow was made contingent on his sister's recovery from AIDS, then it is not binding, as she is not infected. However, if he made the vow contingent on her being found not to be infected, then he must fulfill it if he is able and if the 500 dinars are surplus to his basic needs. If he is not able, then he must offer the expiation for breaking a vow, which is the same as the expiation for breaking an oath.

2. A woman remaining with her drug-addicted husband: She must advise him and remind him of Allah. If he persists and does not repent, then she should separate from him, and divorce is preferable, even if she has children with him.