Photo is of Mirza Muhammad-Quli, brother of Baha'u'llah. He was brought up by Baha'u'llah. He was 7 years older than Abdu'l-Baha. Photo from: http://www.bahai-biblio.org/centre-doc/etude/BAHA/famille-baha.htm "The other brother Mirza Muhammad-Quli, who was only about 7 years older than 'Abdu'l-Baha, had from childhood developed a strong attachment to Baha'u'llah, for their father had died soon after Mirza Muhammad-Quli was born and he was, consequently, brought up by Baha'u'llah. He had a quiet disposition and a loving nature and, throughout his life, remained a true servant at the threshold of his illustrious Brother. He was accorded the honour of pitching the tent of Baha'u'llah on the way from Baghdad to Constantinople, as well as on other occasions, and often used to serve tea in His presence." From The Revelation of Baha'u'llah by Adib Taherzadeh: http://bahai-library.com/