Some people say, Ahl-e-Bayt are only Fatima (ra), Ali (ra), Hassan (ra) and Hussien (ra).
While some other say, Ahl-e-Bayt are only wives of Prophet (sws).
But both are wrong, the Right Ones are those people who say Ahl-e-Bayt include all wives of Prophet (sws) as well as Ali (ra), Fatima (ra), Hassan (ra) and Hussien (ra).
Read Maulna Madoodi (ra)’s answer, who are Ahl-e-Bayt. Read till end.
If you can't read Urdu, then read it from Tafheem-ul-Quran in English
Verse number is 33:33 and footnote number is 50.
The links to this image in parts