Just scrolling down here I saw it again and just stared for several moments. LOL
Lillie won't be in his subgroup just yet, so we have time to work out how well they knew each other. It would have been a case of they haven't seen each other since they were kiddies anyway, so they might not even recognize one another... She's four years older than him as well. So I imagine they might have had a little interaction from around 9:19-9:25 when she left. Putting her between the ages of 9 and 15 and Terin 5-10. We can come up with some ideas for that whenever you like.
Paeral would have welcomed his help, and I imagine that he probably would have looked on the Oros family as the family he'd have preferred to have. So he would not have discouraged Terin, even if he thought him crazy for looking for the Dalish.
LOL I am looking forward to Valan meeting this whole mishmash of people. Because he has a strong case of old man disapproves. He'd be predisposed to like Terin though because he's technically Dalish now. He has a Dalish family and everything. So that connects them in a way that Valan considers very important.