Strange as Libertsy Baptsism is on F/S also but no Siblings.
The only other East Malling Baptism is;
JOHN Leigh, 10 June 1827, Mother ELIZABETH
Zebalon may be a Nephew of the Thomas you found;
ZEBULUN Leigh, 11 June 1826, Snodland, Parents JAMES/ELIZABETH (F/S.Org)
This is on FreeREG also;
Fathers Occp Wheelwright
Does Libertys 1840 Marriage Cert have his Father as Thomas, Occp Barge Builder?
Who were the Witnesses?
Will look around and see what else I can find
Trish