Data source is the 1971 self published book by Richard Glenn Huffman [deceased], "George Muma Genealogy".
Single and never married. Was residing with his father in the 1880, 1900 & 1910 census of Union townshp of Adams Co., IN
His tombstone is in shown in Findagrave
https://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=33153257
Death of Milton Mumma
(Special to the News.)
DECATUR, INd., Feb. 24. -- Milton Lafayette mumma, aged forty-six, died Sunday evening at 8:2 o'clock at the home of his father, John H. Mumma in Union township , after a two years' illiness, with dropsical complications. The deceased was never married. Besides the father, he leaves two brothers - C.S. Mumma of Union township; W.W. Mumma of Monroeville. A sisterm Etta Harden, is deceased. The funeral will be Tuesday morning at 10 o'clock from the Pleasant Grove U. B. church.
[The Fort Wayne (IN) News and Sentinel, February 24, 1919]