What is the ruling on praying the combined prayers in congregation at home after performing Fajr in the mosque, and likewise, making up for missed prayers from 4 or 5 years ago, and is it permissible to make up for more than one missed prayer of the same type along with the current prayer?

The method of making up missed prayers is explained in Fatwa no. 72777. It is recommended to be diligent in making them up in order (Fajr, then Dhuhr, then Asr, and so on) to avoid the disagreement of those who consider order obligatory in making up missed prayers. If one prays a number of missed prayers of the same type with each [current] prayer, we hope that this will be sufficient, as the opinion that sequencing is not obligatory is a strong one.