In 1841 William Rosewarne, aged about 20, born in the county, was with his parents in Penwarne, South Hill, Cornwall.
At the time of the 1850 U.S. Federal Census William Rosewarren, aged 29, born in England, farming, was in Milton, Cass, Michigan, USA.
iN 1860 Wm. B. Rosewarne, aged 39, born in England, farmer, and wife M. Rosewarne, aged 25, born in Michigan, were living in Volinia, Cass, Michigan. With them were children (born in Michigan) daughter M.E. (5), Chas. E. (3), and Lily (1).
In 1880 V. William Rosevarne, aged 60, born in England, farmer, was in Volinia, Cass, Michigan. With him were children (born in Michigan) E. Charles (22), works on farm, E. Lilie (21), keeping house, H. Frank (15), works on farm, Kitie (11), works in house, and Cass (10).
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Wm. V. Rosewarne, widowed, retired farmer, son of Wm. Rosewarne and Nancy Vivian, died aged 81 years. 2