What a heart breaking story! Getting on that boat in search of better things, only to lose the husband and a child! That momma must have been so lost and over whelmed!! Horrible!
I have THOMPSON family who lived near Tempo, Co. Fermanagh. James THOMSPON immigrated to Ontario, Canada about 1830. Records indicate he was from the townland of Leam, near Tempo. His sister Jane THOMPSON stayed in Fermanagh. She married Oliver HOWE and they lived in the townland of Claranagh, near Tempo. Three of their sons immigrated to Ontarion, Canada --- following their Uncle James THOMPSON To Norfolk County, Ontarion. They settled there or in nearby counties. Mary HOWE immigrated to New York.
By any chance have you tested with Family Tree DNA? If so, let's compare results. I have had some great successes doing this :-)