OK, after doing a little more searching on my own, I see where I may have encountered a problem. The 1880 Census has my Jacob Johnston as Johnson, no T and other sons in this family also have no T (but we acquire it somewhere along the way). Jacob was born 6 May 1809 in PA, his parents were born in NJ (both of them). The census also shows his wife as Eliza (instead of Elizabeth). Their son John lives next door with the Trump family as a servant (this John married into the Martin family). Does this help ring any bells? Thanks, Kristen