William is named on a burial maker with Ichabod and Sybil Tubbs, and Ichabod's parents, Seth and Phebe Tubbs. Haven't yet found other documentation that William is Ichabod and Sybil's son. Given the date of birth/death, it seems a reasonable assumption until proven otherwise.
“Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVG7-6H2P : 13 December 2015), William Tubbs, 1825; Burial, Greene, Chenango, New York, United States of America, Tremain Cemetery; citing record ID 109771766, Find a Grave, http://www.findagrave.com.
Burial marker reads as follows:
TUBBS, S. - d. 1837 - age 99 yrs (Tubbs), R. - d. 1828 - age 85 yrs (Tubbs), William - d. Sept. 10, 1825 - age 11 yrs (Tubbs), Ichabod - d. Mar. 18, 1832 - age 73 yrs (Tubbs), Sybil - d. Mar. 30, 1847 - age 77 yrs
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