Hi Pennie
On the IGI Index there is a Samuel Clack listed b 1704 of Filkins Broadwell Oxford. His marriage was on 29 Sep 1725. Date of burial: 26 Feb 1760.
His wife was listed as Elizabeth Simpson born abt 1706 of Filkins Broadwell Oxford. Date of Burial 1738.
On the listing it names a son Samuel Clack 1734.
If Elizabeth Simpson died in 1738 it would explain the half siblings recorded on the Squire tree. There was probaly another marriage.
It's strange that Charles and Ann b 1736 are not mentioned on the IGI. Perhaps Chadris (Squire Web full tree) knows something we don't. I wish he would make contact but nothing from him yet.
Regards
Maureen