Thanks for your reply. As you see, that post went unanswered until now. However, some time after I posted it, I made contact with Jack MacDonald, an authoritative Allen researcher, and he was able to clarify those relationships for me. His website
traces these Reubens back to George Allen, the immigrant, who came to Plymouth Colony 1635.
Jack corresponded with other Allen researchers who provided strong circumstantial evidence that Deborah Allen who married Jacob Rambo is the daughter of Reuben and Mary. Since Reuben died intestate, there is no will to establish a definitive list of his children. However, the evidence for Deborah was judged to be so persuasive that she is now listed among the children of Reuben on Jack's website (in Generation 4).
In case other readers are interested in further information on Deborah, she is also to be found on Ron Beatty's website on the Rambo family, where he is preparing an extensive updating of Beverly Rambo's careful work. A draft of his work can be found at