Hello Frances:
I'm not a Callister relative, but I guess I can "claim" Henry Callister in a way. I have been doing research on a Henry Callister, a colonial resident of the Eastern Shore of Maryland and I think he may be the same one your are looking for. He lived in that time frame, emigrated from the Isle of Man in 1742 and had brothers Ewan, Robin and Anthony. If you are still interested, please e-mail me. Thanks,
Ellen Lawler