I have no imformation on parents or siblings of Jonas Chamberlin. He immigrated in 1731 as a single young man and I assume he was born before 1710 but I have no documentation of his birth date. Sadsbury Meeting Minutes record: Jonas Chamberlin, Certificate of Seperation from Edenderry Meeting, Kings County, Ireland dated 5th, 11m., 1731, recieved 31st, 1m., 1733. Jonas had a son Joseph, born 4, 2m., 1749 but he died 20, 10 m., 1751. Joseph was a common name through the generations of Chamberlins but I can connect your Joseph. Sorry that I can't be of any more help.