I noticed it has been a few years since this was posted hopefully you have found some more info. But just in case...from my research, i believe that I am also a decendent of Jacob and Susanna Alsip, their son, Josephus Alsip(b. 1842) married Anna Marie Poffenberger, their daughter, Susan Alice Alsip married Frank Lenhart (my 2nd great grandfather)
I just began work on compiling a family tree. I don't have much yet, but I will share what I have. I am hoping you might be able to enlighten me also :)