I too am researching this line of Allens. Please feel free to contact me via email if you have further questions.I do not have my full tree info with me at work today.I will try to post further info later.
I show that:
1) Isaac Allen and Lydia Leonard had 2) Isaac Allen who married Amy Dean
2) Isaac Allen and Amy Dean had: a) Lydia b) Mercy c) Alice d) Sarah e) Eunice f) Avery g) Stephen h) Calvin who married Eunice Delano i) Jabez
I list as the children of Calvin and Eunice: Polly, Lucius, Philo, William, Edwin, Angelia,Eunice, Calvin, Harriet, Benjamin, James Harvey, Susan Melissa
My family tree descends from the James Harvey line.I'd love to have info on the otherbranches however.