Sandra, fantastic research.
George seems to have worked at the Treasury Dept, and I googled the 633 15th st nw, Wash.DC. It didn't show up, but there is a building across from the Treas. Dept that looks like it might have apartments above the street level. Street level is home to a large tavern.
Just found:
SS Washington, Southampton to NYC
landing 2 Mar 1951
George Fridrich and family
Residence:
2633 15th St. N W, Washington D C
The elusive "Aunt", Mollie Annette Blake, has been found.