Hi,
I am also looking for a
Gast relative, Rosa
Belle Gast born around 1870, married to a Sam Jacob
Carroll. I had seen the info about your Gasts on the board here, and started doing some research. Most websites concerning Pierre du
Gast are Canadian or French. I went to a site, I think it was Geneanet, and was able to find his family tree. It was in French, but from what I could make out, he was childless. It did show him having a sister. Your ancestor may have come from an unrecorded brother or other close relative.
Donna