The following is from the notes given to us by my husbands uncle.
Children of Sir John St Aubyn and Martha Nichols are: James St Aubyn, b. 1783, d. 1862, married Sarah White Martha St Aubyn, b.1784, d 1861, married Captain Thomas Dean Pearse 1801 Robert Thomas St Aubyn, b. 1786, d.1875, married Frances Fleming St John 1813, d.1863 Mary St Aubyn b. 1787 in St Michaels Mount, Cornwall, d.Sep 28th 1852 in Ashwell, Herts. m. Rev Henry Morice Dec 31 1801 in St Georges Hanover Square. John Humphrey St Aubyn b. 1790, d. 1857 arried Ann Pilkington b.1790.
The notes say there was a total of 15 illegitimate children between Martha Nichols and Juliana Vinicombe but we only have the above names as children of Martha, and a note about Mary`a half brother Edward son of Juliana who was made a baronet in his own right.