Huh? President Buhari's PA who just wedded is actually his grandson?

It will be recalled that Sabiu Yusuf Tunded, an aide to President Buhari got married over the weekend in Kaduna. The grand wedding was attended by Vice President Yemi Osinbajo, Speaker of House of Reps. Dogara, Emir of Kano, Chief of Staff to the President, Abba Kyari, Ministers and other dignitaries. APC Chieftain, Bisi Akande referred to Mr Yusuf as Buhari's grandson while speaking about