Thank you for your message. Unfortunately I have very little information about my Grandfather apart from the message I posted. The only other information I have from my family is that my Grandfather & his family lived in Carmichael Street in George Town. I also believe that my Grandfather was actually married when he was in British Guyana and I think his wife's name was Matilda. I'm sorry that I don't have any more information.
Unfortunately I have never heard my family mention the names Sinclair, Abraham, Power (Poyer)or Teresina but I will ask my eldest Sister about these names when I next see her.
If you have any more information then please let me know.