grandancestor means A distant ancestor. Lexicurio rates it Sui generis — a strength score of 95 out of 100.
Etymology
From grand- + ancestor.
noun
- A distant ancestor.“In concluding this sketch, it affords the writer much pleasure to state that the time-stained pages of the old record shows not a single case of theft, petit larceny, forgery or perjury on the part of the grandancestors of our old Norfolk families.”