I have 8 children. The first two were named John (bp 8 Sep 1809 Santon) and Thomas (bp 4 Aug 1811 Santon) but seem to have merged to become "John Thomas". I wonder why that is?
The other child you missed was Margaret bp 9 Apr 1816 Santon. She was mentioned in the list of the 5 younger Pearson children in their grandfather John Gelling's 1829 will (see my other note just written in answer to Frances).

I have Margaret's death but I don't have her husband John Pearson. Do you have that, including an age?

I've never tried tracing the Pearsons, so I'm afraid I'm no help with them. The Gellings go way back in history and can help with that.