Quote pink sassylady: Might be wrong but ash is Jack and billy sister . Wouldn't it show that in the markers that ash could be related to Faith.if Faith was jacks or Billy.
they were testing for the maternal DNA link which is a separate test from paternal DNA the test is exclusive to the maternal lineage which means that the fact that Billy and Jack could not be excluded by the test preformed to determine if Faith belonged to Ashley or Sharon. That aside Billy and Ashley do not have a biological connection since they don't share the same Biological mother or biological father. Therefore your theory would still leave only Jack excluded as Faith's father.