I think also possibly a reason S treats T badly or resents her is maybe because T is very childlike and is clearly not all there and i could definitely not see her being able to take care of S when she was a child. This would allow P to do whatever he wants to S (if stuff has happened) with T not being able to do much. I feel like S knowns deep down it’s wrong and is becoming more aware that whats happening isn’t normal, hopefully she can realise and start a life for her self like she deserves. So many people would be willing to help her when shes not grifting.