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One other thing I forgot to mention, my mothers nicname is Tilly! (her real name is Mary Madelyn Tillett-Reidy) There were a lot of Tilly's too. However, Tilly was a common (real) name. Last, check in Leesburg, there were Tillett's in Leesburg VA, and many moved around, so you may want to check in Washington DC, and Maryland. This is a Tri-State area, and it's wise to check all of them, because many moved to one or the other of these three.
Again, good Luck. Sheila