Jankauskas is something like the 3rd or 4th most popular name in Lt. so, like me - you may have to wait for clues to come to you.
As for Gill in Pa, there is a Bill Gill that runs a junk yard I Clearfield County, Don’t know if he is still alive, but may be worth a shot. I do know that he had kids too, so there is someone there to ask. Cant remember where in Clearfield though? Altoona? Not sure. If you get this message and REALLY are interested in finding them, Ill see what I can do to locate them again.