A biography of Dr. P.G. LaChappelle is included in "Progressive Men of the State of Montana"On 15 Sep 1874, he married Miss Philomene Rock de Dubie, born 1853, Montreal, daughter of Baptiste and Tercile (Flowerine) Rock de Dubie, natives of Canada. LaChappelle children: Joseph P.L. (deceased), Eugene A. (deceased), Anna Eugenia, Amelia Elizabeth, William A.