Johann was born about 1880, the son of Johann Robert Dumont but his mother is unknown. The place is not known.
His wife is not known. They were married, but the date and place have not been found. Their only known child was Ewald Johann (c1905-?).
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| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Birth | ABT 1880 |