Family: William H. Cotter / Katherine Thewlis (F29149)
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 | William Thomas Thewlis (1882-1948)
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 | Mary Clahan (1885-1965)
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| Williard Thewlis (1899- ) |
| Francis Thewlis (1904- ) |
| Mary C. Thewlis (1911- )  |
| Violet Marie Thewlis (1913-1989) |
| Marion Thewlis (1914- ) |
| William Quentin Thewlis (1915-1990) |
| Joseph Francis Thewlis (1917-1982) |
| Katherine Thewlis (1910- )
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| William H. Cotter (1910- ) |