Charles was the son of John W. Postlethwait and Elizabeth Wise. He married Clara Ethel Means on June 30, 1903 in Valier (Perry Twp.), Jefferson Co., PA.
Charles and Clara were the parents of four children:
1. Mildred Irene (Postlewaite) Abbey
2. Britta Louise (Postlewaite) Nesbitt
3. "Isabel" Clara Isabel (Postlewaite) Nesbitt
4. "Betty" Laura Elizabeth (Postlewaite) George
Clara Ethel Means Postlewaite
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