Jimmytom on Family Tree Circles

Both John and Jane and their son John were all born in Northern Ireland. They are buried in Mt. Moriah cemetery in Philadelphia PA. I believe they immigrated to Philadelphia after 1839. I have searched ships logs available on line but have not been able to piece together a logical story. Unfortunately for me, Thompson seem to be a common name in Ireland. Most probably they came to Philadelphia with other family members but I can't find any traces in the records. I don't know Janes's maiden name. They were Protestants here in America so were probably the same in Ireland. Later generations were of all different faiths.