I don't know about the Good Evans, since there's the draw-back for them that the judges at least only thought the boy was any good, charm aside, so if the rest of the family don't work whatever song they sing well, that could counter however good the boy is, and it depends who they're up against.
Is there only one semi final left....?
I hope Gregg does well and gets through, because I think he's good AND unique/different enough not to just seem like yet another singer making it to the finals.