he other 5 ballots were for other people in their household... so your friends would need to forge the signatures well enough to fool the signature verification process.
You are assuming. No the other 5 ballots were for people that did not live there. Perhaps they had in the past.
And no... no one I know voted that way. Yet in 2000 Mules they found plenty of people that did. Yes, they know exactly who they are.