Hi, I'm Carol Ann Gsell from Oregon, with a brother William Earl Gsell and sister Nancy Jean.
Our father was William Earl Gsell (1918-1999) from Olathe, Kansas, who moved to Oregon in the late 1940's. He had a sister, Elizabeth and a younger sister, Virginia. His father was also William Earl Gsell, a pharmacist, with a brother who was a likable multi-talented businessman; both of Kansas. The men were relatively tall and handsome; towheaded in youth with sandy to dark brown hair and light blue eyes. Outdoorsmen by nature they all seem to be good marksmen, hunters and fisherman.
His father was Earl William Gsell who, from Alsace-Lorraine area of Europe with relatives in Switzerland. He immigrated to Pennsylvania in the early 1800's.
I don't know of any Mentzers though.