Hi Kenneth It depends on how far back the pedigree goes. You can use what is basically an unsourced genealogy as a source on profiles born 1700 and after, but profiles born before 1700 profiles have to have a reliable source. As you say you are not sure how accurate the pedigree is, then it wouldn't be considered reliable.
As others have stated, it is always best to try to confirm the facts on any unsourced genealogy.