The better idea is to just not vote for him. Then the question becomes moot.

If the mother was an American, supposedly that makes him an automatic American citizen. Did he have dual citizenship or not? Regardless of whether we like him or not (ie, Obama) if one parent is a U.S. citizen, then that is supposedly a qualifier. Otherwise, none of our U.S. military brats born overseas are considered U.S. citizens. Is that fair to our members of the military service? What if a child is born in an airplane? It has happened.

Regarding his father being a communist, I am more concerned with Obama's childhood mentor, Frank Marshall Davis, a communist USA member that was being sought by the FBI at one time. Obama's father was a socialist and his mentor for many years was a communist. Obama's father was a Muslim, which by the way makes Obama automatically Muslim by birth.

Are the sins of the father passed on to the son?

Like I said before, I have no intention on voting for Cruz, but I'm not sure that he is disqualified by citizenship, unless the court deems otherwise. Hate to see him get the nomination and then have the Dems take him to court and have him disqualified just prior to the general election. Better to play it safe and vote for Rubio.