Lets ponder upon what you have just said. Firstly you have made loads of assumptions here to concoct a nice interpretation of Ahle Bayt to suit your needs. Where on earth did you get the idea that the relationship of son in law and father in law can survive if the the son in law produced offspring? If the inclusion of Ahle Bayt includes the entire banu hashim then why did the Prophet made a special supplication to include Ali in the Ahle Bayt (according to you)