Their dad was the late Alhaji Umaru YarAdua, GCFR, Nigeria's former president, who took over from Chief Olusegun Aremu Okikiola Obasanjo, GCFR. The dad preceded Dr. Goodluck Ebele Azikiwe Jonathan, GCFR, who was actually the Vice-President before taking over after the untimely death of YarAdua.
Their mom is the famous, no nonsense Turai YarAdua, the former first lady. From the above picture, it is very obvious that the trio are doing very well.
Imagine that each of them is married to an Ex-Governor of a State. Maryam's husband is the former 2 term Governor of Katsina State, Alhaji Ibrahim Shehu Shema, Zainab's husband is the former Governor of Kebbi State, Alhaji Usman Saidu Nasamu Dakingari, while Nafisa is married to Isa Yuguda, the former Governor of Bauchi State, who was first the Minister for Aviation, before he later became a 2 term governor.
By the above, it's obvious their mother did very well, by positioning them very well.