A seious question. How Feroze (Husband of Indira Gandhi) got the surname of "GANDHI"?

Indira Gandhi, daughter of Jawaharlal Nehru, became prime minister of India in 1966. Mrs. Gandhi was born on November 19, 1917 to Jawaharlal and Kamala Nehru. She was named Indira Priyadarshini Nehru. She fell in love and decided to marry Feroze Khan, a family friend. Feroze Khan’s father, Nawab Khan, was a Muslim, and mother was a Persian Muslim. Jawaharlal Nehru did not approve of the inter-caste marriage for political reasons . If Indira Nehru were to marry a Muslim she would loose the possibility of becoming the heir to the future Nehru dynasty. At this juncture, according to one story, Mahatma Gandhi intervened and adopted Feroze Khan, gave him his last name (family name/caste name) and got the name of Feroz Khan changed to Feroz Gandhi by an affidavit in England. Thus, Feroze Khan became Feroze Gandhi.