Bismihi ta'ala
It is mentioned in history books of both Shi'a and Sunni sides that at the time of the martyrdom of Imam Hasan al-Mujtaba (a.s.), 'Aishah gathered some people, mounted a mule, and prevented the Imam from being buried next to his grandfather's grave.
In order to avoid any further bloodshed, Imam Husain (a.s.) buried his elder brother in Jannatul-Baqi' Cemetary.
With prayers for your success.