Hi Andrea.....Yes there are quite a few of us that are descendants of Patrick and Sita! If your grandmom Margaret was the one that prepared the Boatswain family list, we are all very grateful.
I don't know the history of slavery in our family, but it stands to reason that it existed. The British government did not abolish slavery on the Caribbean Islands until the 1830s.
We have a facebook page if you would like to join. Look for the Boatswain Connection. We are scattered all over the world and some still reside in the islands. As for reunions, I don't know of one but it sounds like a great idea.