Is a wife obliged to perform Umrah with her husband's relatives who mistreat her and do not observe prayers, or should she wait for another opportunity to perform it alone to be able to achieve devotion and concentration in worship?

If the husband's family has bad manners, it is not advisable to travel with them for Umrah to avoid problems that might affect the marital relationship. It is preferable to wait for a better opportunity or for the husband to go alone. However, if harm is guaranteed to be averted, or if you are able to endure, then there is no harm in traveling with them.

Both spouses should strive to put an end to the discord with the husband's family due to its negative effects on their lives, while committing to not showing animosity and avoiding sinful words and actions.

Regarding prayer in the car: It is not permissible to perform obligatory prayers in it except in cases of extreme necessity that prevent dismounting, due to the impossibility of fulfilling all the pillars and conditions of prayer. As for supererogatory prayers, it is permissible for a traveler to perform them in the car.