Isaac Whisman had at least 3 sisters
Hannah married Samuel Hinson
Mary married James Henry Maupin (Mary named her son Isaac and her daughte Margaret Elizabeth - supposidly for her parents) I do not know the actual name of Isaac's parents.
Ibby married William B. Taylor
I have information on most of the children, except Hannah - as she does not appear in the census records. There is another Samuel Hinson in Jersey County, Illinois - but he marries once and remains married to the woman his entire life)
I have alternately the names of Michael and Isaac as his father. I believe the family immigrated from Virginia to Illinois between 1800 - 1830.