Hi Denis,
The sixth child of Dr Thomas was Sydney Thomas who was born in 1842 and only lived 7 months. 6 children but No descendants of Dr Thomas I am afraid.
MARTYN Mary Frances Born Mar 1/4 1841 St Columb 9 67 - Bap 19 Feb 1841 St Columb Major father Surgeon Of St Columb
- Mar 1/4 1843 St Columb buried 18 Mar 1843 aged 2 Years Of Market Street St Columb
MARTYN Sydney Thomas Born Sep 1/4 1842 St Columb 9 60 - bap 25 Jun 1842 Father Surgeon Of Market Street
- Mar 1/4 1843 St Columb buried 17 Feb 1843 St Columb Major aged 7 Months Of Market Square St Columb
MARTYN Frances born 10 Feb 1844 St Columb 9 72 - bap 18 Mar 1844 St Col Major Father Surgeon Of St Columb Town
- Sep 1/4 1910 St Columb buried 27 Aug 1910 St Columb Major Aged 66 Years Of Ashleigh St Col
MARTYN Janet born Sep 1/4 1845 St Columb 9 54 - bap 17 Aug 1845 St Col Major Father Surgeon Of Bank Square
- Jun 1/4 1865 St Columb buried 15 Jun 1865 St Columb Major Aged 20 Years Of St Columb
MARTYN Sydney Glubb Sep 1/4 1849 St Columb 9 55 - bap 24 Aug 1849 St Col Major Father Surgeon Of Market Street
- Dec 1/4 1876 Ongar 4a 80, aged 27
MARTYN Emily Lyne born Sep 1/4 1852 St Columb - bap 24 Aug 1852 St Columb Major Father Surgeon Of St Columb
- Jun 1/4 1934 St Columb, aged 81 buried 1 Jun 1934 St Columb Major aged 81 of Ashleigh St Columb
The three baptisms I have for Maria and Thomas TRELOAR are
Charles Edward 25 Mar 1847 Kenwyn
Henry Martyn 28 Jan 1849 Kenwyn
Maria Louisa 1 May 1851 Kenwyn
Cheers Kris