No, Bobby Darin is not related to James Darren. The spelling of their last names is not the same, either.
Sandra Dee, in 1960. In 1973, right before his death, he married and divorced Andrea Yeager.
Simple Song Of Freedom
He donated his body to science, though I understand there is a rock and a plaque donated to him by his family in LA.
1. 125th Street and Second Avenue, Harlem 2. 60 Baruch Drive on the lower East Side near the FDR Drive3. 629 East 135th Street, Apt. 2-W Bronx (1954)