Pieter Buis was born 17 February 1860 in Lagedijk, Wervershoof, North Holland, Netherlands to Klaas Buis (1824-1895) and Trijntje Pennekamp (1822-1909) and died 15 November 1906 Hem, North Holland, Netherlands of unspecified causes. He married Geertje Grooteman (1864-1912) 20 April 1887 in Wervershoof, North Holland, Netherlands.
Children
| Name | Birth | Death | Joined with |
| Catharina Buis (1888-1960) | 2 April 1888 Wervershoof, North Holland, Netherlands | 24 August 1960 Hoorn, North Holland, Netherlands | Cees Weel (1887-1953) |
| Fransiscus Buis (1889-) | |||
| Klaas Buis (1891-) | |||
| Anna Buis (1893-) | |||
| Martha Buis (1894-) | |||
| Cornelia Buis (1896-) | |||
| Mina Buis (1898-) | |||
| Elisabeth Buis (1900-) | |||
| Johannes Baas (1901-) | |||