I have very little information as I ahven't had time to research this line of the family yet. The only sibling I have for Jane Gault is an E Gault (possibly Ellen after the mother) born about 1806 and their parents John Gault (born abt 1780's) and Ellen Douglas (born abt 1785ish) and married in Belfsat in 1805. If I go by Jane's daughters names there may have been a Mary and or Margaret and the boys were Robert and George. They would probably be cousins somewhere along the line.
Sorry I can't be of any other help just now but will get to this family one day, famous last words. Would like to keep in touch though. Regards Joyce