Janice: The story goes something like this, as detailed in an unpublished booklet by Estelle Alston Ricchiuto and Jocelyn Myhand Garuthreaux called Myhand Family - Roots and Branches. John Isaac Gibson was one of the children of William and Marie MacKenna Gibson. They worked on a boat which plyed the Mississippi River. They had friends in the Port Allen area, and visited them when his boat stopped there. One time he brought the children with him and left them with some friends there, saying their mother had died. Eventually, after not hearing from Mr. Gibson for some time and assuming he had died, the family adopted them and they were baptized in the Catholic Church.
One of John Gibson's daughters, Estelle, married Crawford Henry Myhand. I am Estelle's 2nd great grandson, as their daughter Melissa married Louis Gilbert Hebert, my g-grandfather.
If you notify me, I will try to put you in touch with Ms. Ricchiuto, who lives in California, or Ms. Gauthreaux.