Whoopee !
Reckon this is also ours, having in the past contacted the 'Joplin's site' which has a comprehensive account of Angas tree, the only other Silas appears to have been this one's son (who was a Tailor, then ran a Pub - then off to New Zealand ind 1917, into Army reserve , out and continued tailoring,)had Two sons and two daughters.
Now to go back a bit Thomasine (as married off by Tammy ! ) had a Brother George (A Carriage Lamp Maker, living in London ) This George's wife (Elizabeth Lerway ) in 1838 gave birth to yet another Lavinia, who in 1867 married William Angas ( son of Silas Angas - Master Mariner, and at that time the family were living in the Trinity Houses in Deptford).
Son William was into selling Ironmongery, so can maybe, be assumed that he met Lavinia while selling to her Dad ?
Anyway after the wedding all the family went back to the North ( Sunderland) where for a time they were running the 'Bath Hotel' in Moor Street Bishopwearmouth.
I had not yet started on old Silas's sea career, so that will be a helpful one. The old man was born in 1787, and died in 1876 aged 89 - must have been the Deptford air to last that long !!!!!!!!
Best
John