Is it permissible to pray in congregation at home with an elderly father who is unable to leave due to being connected to a medical device?

If the father is elderly and unable to go out to perform congregational prayers, he is excused and will receive the reward of the congregation. As for the sons, they are required to attend congregational prayers at the mosque, especially if they hear the call, because performing congregational prayer at home does not absolve them of the obligation to answer the call, and what is required is attendance at the mosque.