The Theo line is one of the four lines of Coad from Central Cornwall. We are unable to work out their origins, mostly because the parish registers of St Stephen in Brannel have been lost prior to about 1690.
If you look at my database "brannelcoads" at www.worldconnect.com and search for Theo, you can see the Theo line. Your Theo was probably the son of the first Theo (~1650) and Joanof St Stephens (but he might have been a nephew). He turns up in St Erth in 1704, quite a distance from St Austell. We know he was a cordwainer or high quality bootmaker, and they were a fairly mobile occupation. Later generations also often had a technical bent.
The name Theophilus keeps cropping up in later generations: the last two were Theo 1809 of Marazion, a fairly wealthy gas engineer, and his nephew Theo, a mathematical instrument maker. The latter had a patent registered in Australia. Both married twice.
Im not actually sure there are any living male COAD descendants of your Theo - the male line may have died out.
If you have more detail about your family that is not in the gedcom - could you please let me know?