source is Misc.Gen.Her.cit. and Am. Gen.29:215-218.
source is for Thomas and his father John and g father Thomas is:P.134,135 New england Gen.Reg. vol.75d on which we find Fam Ped. written by ggson of John Gifford born 1431. This ggson is Thomas Gifford and is recorded in Heralds College,England. Also source "Testator of 1550" vol.74 p.270 lists son Thomas as aged 30 yrs. or more in 10 Nov 1511.