Iíve hit a brick wall on my 5th great grandparents

John Thompson abt 1765-??
Eleanor Thompson abt 1771-??

Possible marriage to a Eleanor Cram?? 21 Nov 1789 In Newcastle

Children:
George Thompson abt 1791 (4th G Grandfather)
Jane Thompson abt 1799
Thomas Thompson abt 1801

Obviously working backwards from the children I canít find a positive conformation on this set of parents. Have I even got the right siblings for my 4th great grandfather George Thompson??

Any help or point in right direction would be HUGELY appreciated..

Thanks, Lisa x