Hi, I assume you are the owner of the following:
http://mclemoregenealogy.org/getperson.php?personID=I8656&tree=McLemoreAbel's death certificate states that he was born in Carlton, [Orleans], NY. The following shows that Abel and Alonzo are indeed the sons of Hanford Dickerson.
The 1850 Census of Hanford Dickerson (Peckesson) of Carlton, Orleans, NY
Dickerson, Hanford, 39, shoemaker, b. NY
Clarisa, 33, b. NY
Able, 14, b. NY
Alonzo, 12, b. NY
Tyler, 9, b. NY
Melissa, 7, b. NY
As for William, the 1830 census mentioned above:
1830 Census: Murray, Orleans, NY
William Dickson males: 1 (15-20) would match Hanford, 1 (40-50) would be William
females: 1 (20-30) possibly Fannie Eliza, 1 (30-40) unidentified, and 1 (40-50) probably Phoebe
1840 Census: Superior Twp, Washtenaw, MI
Wm. Dickerson males: 1 (50-60)
females: 1 (<5) Phebe Jerusha, 1 (50-60) probably Phoebe
1840 Census: Augusta Twp, Washtenaw, MI
F.E. Spaulding
males: 1 (<5) Erastus H Spaulding, 1 (5-10) Henry C Spaulding
females: 1 (<5) Fanny M Spaulding, 1 (5-10)Phebe A Spaulding, 1 (30-40) Fanny Eliza
1850 Census: Augusta, Washtenaw, MI
Wm. Dickinson, 68, b. NY, farmer
Phebe 63, b. NY
Jerusha 15, b. NY
next entry:
James Morgan, 48, b. NY, farmer
Fanny E 42, b. NY
Fanny M Spaulding, 11, b. MI
Phebe A Spaulding, 15, b. NY
Henry C Spaulding, 17, b. NY, farmer
Mary E Morgan, 8, b. MI
Wm. M Morgan, 4, b. MI
Charles Morgan, 2, b. MI
1860 Census: Augusta, Washtenaw, MI
James Morgan, 58, b. NY, farmer
Fannie E 51, b. NY
Mary E 17, b. MI
William W 14, b. MI
Charles H 12, b. MI
Levi B 3, b. MI
William Dickinson, 78, b. NYFannie M Spaulding, 20, b. NY
1870 Census: Augusta, Washtenaw, MI
Morgan, James, 67, b. NY, farmer
Eliza, 61, b. NY
Charles H, 21, b. MI
Mary E, 26, b. OH (1860 shows her born in MI)
Emma H, 3, b. MI
Henry C Spaulding and family are enumerated 3 positions below the Morgans
So to answer your question about the children of William and Phebe: Hanford seem to be a son, and Fanny Eliza seems to be a daughter.
Fanny married first, Erastus Spalding and is on his tombstone pictured here:
https://www.findagrave.com/memorial/23342314/erastus-a-spaldingAll of this material can be found on
www.familysearch.org -- a free site, but you might need to sign up to be able to see the original documents