Hi CP,
I have been taking a look at this and I think this is what you are after
MARTIN Richard =
PERRY Sarah 6 Dec 1803 Falmouth
MARTIN Elizabeth b 15 Dec 1804 and baptised 25 Jan 1805 Falmouth Parents Richard and Sarah
MARTIN William baptised 26 Oct 1806 St Gluvias Parents Richard and Sarah ....at marriage to Mary Ann ROBERTS 11 Nov 1838 Madron he lists as William Perry MARTIN, he was 32 she was 33
MARTIN Richard baptised 6 May 1807 St Gluvias Parents Richard and Sarah
MARTIN Sally Perry baptised 1 Feb 1811 Penzance Father Richard
MARTIN Mary baptised 22 Nov 1812 Penzance father Richard
MARTIN Sarah was buried 23 Jul 1826 Penzance aged 50
I believe this is Sarah because Benjamin Perry aged 55 is with Richard and family in 1851. He is Sarah's young brother
PERRY Sarah baptised 10 Jul 1777 Wendron parents Benjamin and Margery
SiblingsWilliam 9 Dec 1779 Wendron
John 17 Mar 1782 Wendron buried 9 Oct 1786 Wendron
Jane 13 Jun 1784 Wendron
Ann 9 Jul 1786 Wendron
Margery 10 May 1789 Wendron
Benjamin 19 Jul 1795 Helston
PERRY Benjamin =
PAPPIN Margery 26 Apr 1777 Wendron
I believe this is William because he lists a birth in St Erme 1780 in the 1851 census
MARTIN Ric baptised 31 Dec 1780 St Erme Parents Wm and My
SiblingsMARTIN Eliz baptised 23 Jan 1785 St Erme buried 18 Aug 1791
MARTIN Prud 23 Jan 1790 St Erme
MARTIN Wm 23 Mar 1793 Buried 3 Mar 1799 St Erme
MARTIN Tho 21 Aug 1796 St Erme
MARTYN William =
LOB Mary 7 Feb 1779 St Erme
Cheers Kris