Can God punish parents for their children's sins, and will one's deeds be exposed before everyone on the Day of Resurrection?

The two fiancés are considered non-mahram (definition) to each other before the marriage contract is concluded, and it is not permissible for them to be in seclusion. Sincere repentance is obligatory for whoever falls into something forbidden. Allah will not hold the parents accountable for a sin committed by their children, for every soul is accountable for what it earns, and no bearer of burdens will bear the burden of another. Sincere repentance erases what came before it, and one who repents from a sin is like one who has no sin, and the forgiveness of sins means their concealment and overlooking them.