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I meant to suggest that maybe they met in Inquisition. My mistake. My hypothetical is that the plot allows for Alistair to meet the child and form his own opinion.
Not having played Inquisition, we can hypothetical all we want.
Would he be able to meet the kid long enough to want to attempt to hand over the reigns of the kingdom to it? (After all him giving the kid support hardly means they'll be the next king, since the landsmeet picks and even if alistair can somehow see past his personal hate for morrigan, I find it unlikely the landsmeet will look past her mageness and non andrastrian chasindness)
I mean why not support someone, anyone, he knows and trusts over a kid Morrigan will most likely never allow him to have extended interaction with? Or who has a better chance of both getting picked by the landsmeet and ruling well?
I mean if there are any other serious contenders the landsmeet wants, unless they are basically loghain reborn, I doubt Alistair will want to fight them on this and put up Morrigans kid for it.
Plus if Alistair is the father the kid had to have been made with the dark ritual and I reeeeeaaallly see that tainting Alistairs view of the kid.