To the best of my knowledge:
Richard (b. 1737 d. 1773) and John (b. 1739?) were the children of Mordacai Mendenhall and Charity Beeson.
Richard Mendenhall was my 5th greatgrandfather.
-Richard (m. Jane Thornbrugh 1758)
--Joseph (was almost 3 when Richard was killed)
-----Louisa(aka Dolly) Mendenhall Cruzen (my GGM)
A good acount of the First Massacre at Powell's River can be found at http://www.rootsweb.com/~varussel/indian/2.html