Well, Happy Birthday!
You can look at the transcribed records for Wendron by searching here
http://v1.cornwall-opc-database.org/personsearchdb.phpor use the IGI batch C053291 for Wendron for Gills with father Francis, more than 2
to parents Francis & Elizabeth Gill
Francis bp 8/1/1792
Elizabeth bp 26/5/1793
Joan bp 17/5/1795
Mary bp 26/2/1797
Richard bp 22/3/1799
Philippa bp 5/9/1803
William bp 2/6/1805
Thomas bp 17/5/1807 (who was a witness to Richard's marriage)
John bp 28/1/1809
Henry bp 22/6/1810 buried 18/11/1810
Henry bp 8/8/1811
Joan is a farm worker in 1841 & a house servant in 1851. Not every woman marries. You can use the opc site to lookj for marriages of the other siblings.
The 1841 census gives very little detail. Sarah & her son might just have been in Breage for the night. We can't tell at this distance. The census is just a snapshot of one night. Her address at time of death is very similar to the one given for John & Thomas in 1841. There is no evidence at the moment that Sarah was staying with/visiting her mother in 1841, could have been a relative but may not. Don't let your imagination run riot!
1851 John is with his father who has remarried
1851 Lower Green, Helston HO107/1912 folio 358 pg 26 - (same address as 1841 & could be where Sarah was living at the time of her death)
John George head mar 41 gas labourer b. Mullion
Ann wife 39 b. Mylor
John T son 14 carpenter b. Helston
Sarah A dau 2 b. Helston
marriage ref
John George dec qtr 1847 Falmouth vol 9 pg 128 with Ann Welch on the same page
John's baptism
http://www.cornwall-opc-database.org/search-database/more-info/?t=baptisms&id=798478John junior can be followed through the census years, he ends up in Surrey. I haven't seen John & second wife & child after the 1851. It's possible that they emigrated
