Theoretically, there could be 4 habitable planets in the Alpha Centauri System.
I have posted this before. It is an oldie, that first appeared in Astronomy Magazine back in the 1980’s but the data still holds up.
The only thing I disagree with is Alpha Centauri C (Proxima). I think Red Dwarfs are going to surprise us. I think some will have Habitable planets. Mercury didn’t fit the model and surprised us because it rotates. Europa and IO didn’t fit the model, surprised us because they are geological active. I think the same will be true with Red Dwarfs.