Who are the Ahlel Bayt?

Re: Who are the Ahlel Bayt?

personally i agree more with defination posted by alijaan

but how are the freed slaves part of ahlulbayt can someone elaborate?
2 examples that come to mind are
abu rafi radiallahanhu who was companion of high rank, pious , narrater of hadith and scribe
and abdullah b masada farazi a ungrateful munafiq
neither of them are ahlulbayt

why the hell do i have a infraction?