Is it permissible to delay congregational prayer with one's wife due to an illness that prevents going to the mosque, or is it better to pray individually at its appointed time?

We advise you to strive to attend the congregational prayer at the mosque whenever possible. If you are unable to do so due to a valid excuse, then your act of performing congregational prayer with your wife at home is a good deed, and you can hope for the reward of congregational prayer while in your home if you are keen to go to the mosque and are prevented by an excuse.

It is better to wait for your wife to pray in congregation with her, as long as she returns before the time expires. The reward of congregational prayer takes precedence over attaining the virtue of praying at the beginning of the time. Therefore, delaying for the sake of congregational prayer is better, and it may even reach the level of obligation to achieve congregational prayer.