Jane [father] John Kelwey/ [bapt] 22 May 1687
Thomas John Kelwey/ 19 Nov 1688
James John Kelwey/ 6 Jun 1691
__ [unnamed] John Kelwy/ 25 Mar 1696
John John Kelwey/ 29 May 1701
John John Kelwey/ 28 Jan 1706/07
Thomas John Kelwey/ 22 Mar 1713/14
Isabell John Kelwey/ 1 May 1720
Anne John Kelwey/ 26 Jan 1722/23

No Margaret Kel....

Margaret John Cowle/ 4 Nov 1725
Margaret John Cowley/ 30 Dec 1725

Other John Cowley children:
John John Cowley/ 7 Feb 1722/23
[so too close to Anne above to be the same father].

No "Kelvie" until 1739.
John Thomas Kelvie/ 15 Feb 1738/39

Suggest you try wills, where previously unknown children often appear.

Sue