Mirza Muhammad-Hasan

From Bahaikipedia

Mírza Muhammad-Hasan-i-Núrí was the half brother of Bahá’u’lláh. His father was Mírzá `Abbás Núrí and his mother was Khan Nanih. Muhammad-Hasan was devoted to the Cause unlike many of his other siblings. Muhammad-Hasan's daughter, Shahr-Bánu Khánum, was once betrothed to ‘Abdu’l-Bahá.