Hello Rob
Thomas Larkin was the brother of my ancestor John.
I have done extensive research piecing this family together across their moves from Brenchley to Goudhurst and then to Cranbrook. My branch then settled in Horsmonden.
I did not come to a conclusion about George Larkin's ancestry.
The Brenchley PRs showed the baptism of a George Larkene on 1 November 1654 the son of Edward a Hempdresser but also a burial of “Geo Larken son of Edward, deceased on 17 February 1664.” The burial of Edward hempdresser was recorded on 11 October 1657.
FamilySearch showed 1 other baptism in Kent for the period 1640-1670:
George Larkin 29 July 1663 Marden, Kent, father: John Larkin mother: Elizabeth
There were others but further afield, the nearest being in London, Sussex and Hertford.
The Marden Parish Registers showed:
1662 September: John Larkin and Elizabeth Indvill were married the 30th day
1663 July: George son of John and Elizabeth Larkin was baptized the 29th day
1663 August: Elizabeth wife of John Larkin was Buried the 2nd Day
There was no evidence of a remarriage in Marden for John Larkin or any burial there .
The Probate Indexes for the Canterbury and Rochester Diocese show no wills that can immediately connect to John.
That was as far as I got back in 2017 and I have not done a thorough review since.
Was Thomas your acncestor?
Barbara