If I am correct, your line from Renald Fernald to Ira is as follows:
1. Renald Fernald and Joanna Warbarton 2. William Fernald and Elizabeth Langdon 3. Ebenezer Fernald and Patiwncw Mendum 4. Jonathan Fernald and Sarah Weeks 5. Jonathan Fernald and Martha Randall 6. Sherburne Furnald and Martha/Serina 7. Ira Fernald and Mary Catterson
You should of course verify these findings, but I believe this is correct, despite some discrepancies.
Some sources have that Jonathan born 1776 never married and died in 1789. Jonathan and Sarah did have at least 2 children named Jonathan, one died before 1776. I do not know the source for those dates, etc. Jonathans father Jonathan who married Sarah Weeks died on 26 Dec 1789. So its very possible some one confused the data for their dates of death, but it's also possible that there is another Jonathan. You'll have to do some research in the Kittery area to be sure. For some reason Jonathan's wife Sarah Weeks is also listed as having died in 26 Dec 1789.
The name Jonathan Furnald first appears in the 1790 census for Kittery, ME. He seems to be he only one listed in Maine. I suspect this is Jonathan son of Ebenezer, who reportedly died in Dec 1789. There are 3 males over 16 and 3 females listed for this household. There is also a Sarah Fernald listed in Kittery with one male over 16, one male under 16 and 2 females. I am not familiar enough with our family history to figure these people out, but I believe there are some books and other sources that have this information. Some day I hope to start collecting some source books to do so.
If you don't already know about it, Cyndi's list is an excellant source for finding sources, here is the Maine link. http://www.cyndislist.com/me.htmhttp://www.cyndislist.com/me.htm
They have links for all the States and more.
Sherburns father Jonathan seems to have moved around. and his age varies from census to census, but I believe they are all the same person.
Jonathan and Martha were married in 1795, I believe this is them.
1800 Monmouth, Kennebec, ME Jonathan Furnell 1xx1x1x1xx male 26-45, (b. between 1774-1755 your Jonathan is abt 24) one male under 10 one female under 10 and wife Martha(Randall)age 18-26
1810 Unity, Kennebec, ME Jonny Farnell2111x221xx 2 males under 10 1 m 10-16 1m 16-26 1m 26-45 (born between 1765 -1784)Jonathan is abt 34 2 females under 10 1 f 10-16 1f 16-26
1820 Joy, Kennebec, ME(now Troy, Waldo, ME) Jonathan Ferneld22111xxx1x1 2 males under 10 2 males 10-16 1 m 16-18 1m 18-26 1m 26-45(b. 1775-1794) Jon is 44 1female 16-26 1f over 45
1830 Lincoln Penobscot ME Jonathan Fernalxxx21x1xxxxxx1 2 males 15-20 1 m 20-30 1m 40-50 (b. 1780-1790) off by 4 years, Jon is 54
also in 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)
Here is where I make a leap to say Sherburn is Jonathans son.
So from the census, (if I am correct that these Jonathan's are all the same Jonathan.) Jonathan FURNALD and Martha RANDALL may have had 6 sons who survived to be in the census and 3 daughters.
male born1794-1800(Sherburn b abt 1799) male born1800 -1790 (Henry Nelsonb. 21 Nov 1806) male born1800-1810(Jonathan b. 1809) male born1800-1810(Thomas H. b. 1810) male born1810-1820(George) male born1810-1820 female born 1794-1800 female born 1800-1810 female born 1800-1810
Keep in mind that I am guessing that Sherburn, Jonathan, George and Thomas are sons of Jonathan and Martha and therefore brothers of Henry Nelson Fernald based on the census and locale. I have not seen any source to verify this. Thomas, Henry and Jonathan are in Troy in 1850 and near each other. Troy is where Jonathan was listed in 1820. George and Thomas both married to Kneelands on the same day in 1831 in Lincoln Penobscot, ME.
George FURNELL and Mary Kneeland Oct 27 1831 Thomas H FURNELL and Louise H Kneeland Oct 27 1831
I didn't hunt too hard for George (yet!!)
1850 Troy, ME
Henry Fernald 43 Mary E 33 Helen 14 George 13 Serina 11 Martha 8 Laban 6
Thomas Fernald 39 Lois 40 Edward 18 Matilda 16 Sarah G 11 Charles 8 Mary S 6
Jonathan Fernald 41 Martha 27 Freeman 16 Mariana 14 Sylvania 12 Joseph 7 Almira 4 Franklin 6 months
Apparently Sherburn moved west abt 1839 about the time of his fathers death.
In 1840 Washington, Allen Indiana, Sherburn has 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 born in Ind? Martha 45, ILL? female Irull? 24 ILL?1826 (Israel Male) 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
If you haven't done so already, and you can afford it, Ancestry.com has an excellant database for searching the census. Sometimes the names are misindexed or misspelled so it makes it challanging, for example even with soundex Fernald might not pick up Fennald. It's better than hunting through the microfish!!
That's about all I can do for now, let me know if you find anything new or find faults with my assumptions so I can update my database.
Too bad I couldn't find Sherburns marriage record, maybe it will turn up!!