Johann was born about 1881, the son of Peter 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 four known children were Hans Johann (c1906-?), Peter (c1908-?), Reinhold Jakob (c1910-?) and Otto Jakob (c1912-?).
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| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Birth | ABT 1881 |