Unlikely to be executed. Iran has its issues for sure, but executing athlete’s families is North Korea level. They aren’t North Korea level.
Blaming the US is ridiculous. This is an Iranian policy.
I have family in Israel so there is likely bias here, but I wish the best to Iran, love their wrestlers and hope for peace in my lifetime between the two cultures. There is a tremendous amount in common and the people would get along well if given the chance.
Always remember these disagreements are usually government vs government not citizen vs citizen.
The US is responsible for letting Iran get into a messed up enough situation where the Ayatollahs were basically allowed to lie and cheat their way into power. But of course us overthrowing their democratically elected government and installing a despot like Reza Pahlavi as Shah didn't make people resent the US intervening in their country's politics. Must have been some other reason.