Bayhaqi 2866 — Evidence that his wives ﷺ are among his household

It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that he (peace and blessings be upon him) said: "Whoever would be pleased to have his deeds weighed out in full measure and be recompensed accordingly, then when he sends blessings upon us, the people of the household, let him say: 'Allahumma salli 'ala Muhammadin an-nabiyyi wa azwajihi ummahatil-mu'minina wa dhurriyyatihi wa ahli baytih, kama sallayta 'ala Ibrahim, innaka Hamidun Majid' (O Allah, send Your mercy upon Muhammad (peace and blessings be upon him), who is the Prophet, upon his wives, who are the Mothers of the Believers, and upon his offspring and his household, just as You sent mercy upon Ibrahim (peace be upon him). Indeed, You are Praiseworthy, Glorious)."
It is as though he (peace and blessings be upon him) mentioned his wives and his offspring separately by way of emphasis, then used a general term so as to include in it his household besides the wives and offspring; and may there be mercy upon all of them.