In comparing records found on FreeReg matching Constance Maddern (as seen on the Overview tab) I found that:
John Maddern b.1808 doesn't seem to fit with William and Constance's record of [John MADDERN] Baptism 16 Nov 1800 Cornwall St Buryan : St Berian the Virgin : Other Transcript
William Maddern b. circa 1802 matches William and Constance's record of William MADDERN Baptism 06 Dec 1802 Cornwall St Buryan : St Berian the Virgin : Parish Register
Mary Warren b.1805 matches William and Constance's record of Mary MADDERN Baptism 04 Feb 1805 Cornwall St Buryan : St Berian the Virgin : Other Transcript (Except name and see below)
Constance Maddern Richards b. ???? can match William and Constance's record of Constance MADDERN Baptism 10 Aug 1806 Cornwall St Buryan : St Berian the Virgin : Other Transcript
Thomas Maddern Richards and
Thomas Maddern both match
Thomas MADDERN Baptism 24 Jan 1808 Cornwall St Buryan : St Berian the Virgin : Other Transcript
Elizabeth Tippett can match can match William and Constance's record of Elizabeth MADDERN Baptism 24 Jun 1810 Cornwall St Buryan : St Berian the Virgin : Other Transcript
Mary MADDERN Baptism 23 Nov 1817 Cornwall St Buryan : St Berian the Virgin : Other Transcript isn't replicated on Geni, Maybe it suggests that the other Mary b.1805 died?
Honour Richards Warren b.1795 doesn't seem to fit with William and Constance's record of Honor MADDERN Baptism 28 Nov 1819 Cornwall St Buryan : St Berian the Virgin : Other Transcript
Any inputs from the stakeholders ,n otified?