I always interpreted the dialogue below (under the read more) to mean Alistair was born and living at Redcliffe Castle before Arl Eamon married Isolde. That the Guerrin wedding was put off due to King Maric’s opposition. And that once Isolde arrived at Castle Redcliffe, Alistair was treated worse and eventually Eamon sent him off to the Chantry at Isolde’s insistence.
I also believe Isolde’s continuing hatred of Alistair is clear when she meets him again with Teagan after the battle with the undean - “Alistair. What are YOU doing here?” Her tone just drips conrtempt at best.
I believe that she may not have known he was Maric’s son - Eamon may have kept that secret.
Just to provide some age check points - in the Stolen Throne after the battle of West Hill Rowan remembers her brothers Teagan , 8 and Eamon 15 - that’s in 8:99 Blessed. So it’s not unreasonable to assume Eamon met Isolde while recovering the arling sometime after Maric defeated Meghren and that they didn’t marry until the early teens, due to Maric’s opposition.
I;d appreciate any thoughts or canon which provides a different viewpoint. This, btw, has nothing to do with the “Who is Alistair’s mother discussion”. It’s just - was Alistair living at Redcliffe before Eamon married Isolde?
Game dialogue re: Alistair’s childhood:follows below:
While I think Alistair can be a very unreliable narrator at times, I’ve always accepted this dialogue at face value, since he is quite specific about the sequence of events and the cause/effect. (I also find it interesting that Connor’s birth would have come right about the time that Alistair was banished to the Chantry. *shrug*)