Hi Neil,
Firstly, I am sorry Sarah is not here in your arms, I lost my son Tejay's twin to M/C, and I have always wondered if he knew, but the strangest things have happened, he is now 2yrs old. He constantly plays with his own hands, and it is not like he is just grabbing at them, whenever he is tired or upset he will do this and it is like one hand is actually playing/comforting the other one....
I find it comforting to know.. In my own little way I feel it is his twin there with him....
Also after losing my 2 yr old Daughter Nikayla, my daughter Maleiya was 6 months old when she died and they were so close, she still see's Nikayla and also my father who died when I was 17, I know this due to her explaining things about both of them that there is no other way she could of known....
It would feel so warm and beautiful, also bittersweet that Thomas is recognizing his sister around him... But I believe it certainly is possible.
Thinking of you and Shirley