Here are my "assumations" for Sherburn and Ira. Plus I think I have another son for Jonathan. His daughters will be harder to track.
1830 Lincoln Penobscot ME Shurburn Fernal2xxx1xxxx1 2 males under 5 1 male 20-30 (Sherburn was born abt 1799) 1 female 20-30 (Martha/Serina)
Apparently Sherburn moved west abt 1840 probably after his fathers death.
In 1840 Washington, Allen Indiana, Sherburn Furnaldx23xx1xxxxxxx2xxx1xxxxxxx 2 males 5-10 and 3 males 10-15, he is 30-40. There are 2 females 5-10 and his wife is 30-40.
The 1850 census (1852?) of Huron, Des Moines, Iowa has: Sherburn Furner (Furnald) age 50 listed born in IND Martha 45, listed as b. in ILL Israel24( listed incorrectly as a female, Irule ) Nelson 20 ME1830 Ira 16 ME Elmira 14 ME Clarinda 10 ME Jane 8 Ind Marshall 4 Iowa John 2 Iowa
1860 Township 11 N 5 W., Henderson, Illinois (post office Oquawka) Sherburn Furnald61 Seremia 50 Israel31 Henry 28 Marshall 15
1870 Township 10 Range 5, Henderson, Illinois Post Office: Sagetown Serina Furnald 60 ME Henry 38 ME
Sherburn had 7 sons and 3 daughters by the census
Israel Furnaldborn between 1826 - 1829 in ME a son born between 1825-1830 Henry Nelson Furnald born between. 1827-1832 ME son born between 1830-1835 Ira Furnald b. Oct 1830 Elmira b abt 1836 Clarinda b. abt 1840 in ME Jane b. abt 1842inIND Marshall Furnald b. Aug 1844IA JohnFurnald b. abt 1848 IA
Ira Furnald married to Mary Catterson on 12/04/1854 in Henderson county Illinois.
1860 Pleasant Grove, Mahaska, Iowa Ira Furnald29MEfarmer Mary23ILL Martha E1ILL
1870 Oskaloosa, Mahaska, Iowa Ira Furnald 39 ME farmer Mary 33 ILL Martha E 11 ILL Robert 4IA John Caterson 24IA
1880 Oskaloosa, Mahaska, Iowa I. Furnald 51 ME ME ME Mary 43ILL KY VA Robt. H.14IA ME ILL Chas. W.9 John Ed5
Ira married abt 1883 to Nancy J. ?
1900 Bald Bluff, Henderson, Illinois. Ira Furnald age 70 Oct 1829 m17y Nancy J. age 65. Apr 1835 Ind KY NY Clara A.Dec 1885IA ME IND He is living next to the household of William Cattison age 66.
I couldn't find anything else on Ira's daughter Martha and her out of wedlock son Jasper, She married Samuel Padget on 22 Jan 1880. Samuel Padget was 2nd married to Cora Crill 11 Feb 1889 according to a rootsweb world connect search. But 1900 census says they were only married 7 years at that time. In either case Martha either died or was divorced and I can't find her. And who knows what happened to Jasper.
I also may have found another son for Jonathan Fernald and Martha Randall and brother to Sherburn, Randall Fernald of Canaan, Somerset, ME. Besides his first name being the same as his mothers maiden name, his brother Henry married Mary Holt who was from Canaan and was living in Canaan in 1840, They are next to each other in the census. Randalls age varies in the census from being born in 1804 to 1816. and to make matters worse sometimes he is listed as being born in NH.
1840 Canaan, Somerset, Maine Randell Fernald xxxxx11xxx1 Henry Fernald1xxx12xxx1
1850 Canaan, Somerset, Maine Randall Fernald 40 Root Doctor born in ME Rebecca33 Nancy J. 13 Arthur R3 Mary F8m
1860Canaan, Somerset, Maine Randall Fernald 44Physician ME Rebecca43 Jane 22 Arthur R13 Mary F10 Henry C 8 Herbert V5 Josiah 3
1870 Canaan, Somerset, Maine Randall Fernald 58 farmer NH (ME??) Rebecca53 ME Arthur R23 Jenny 29 Henry C 18 Herbert 15 Josiah 14
1880 Canaan, Somerset, Maine Randall Fernald 76NH NH NH (must be ME!!) Physician Rebecca62 ME ME ME Mary F 29 ME ME ME
Josiah K. Fernald23 ME ME ME Julia E 20 Arthur 4 Lottie B 2 Lizzie West 21 boarder
Randall died Feb. 4, 1883 in Canaan.
I know I threw a lot of data at you, I branched off on some of these messages so I hope its not too confusing, Since they are the newest msgs they are easy to see straight from the genforum. Remember that these are clues and to try to verify these findings, but I think we are on the right track and may have helped to reconnect more than a few loose ends on this tree.