And you seem to be thinking that the Andrastian nobles have more say in the affairs of the people than the seers, when every text clearly says otherwise.
The only text you provided mentioned the Chantry, and not the Andrastian nobles. If you have any actual evidence to provide supporting your case, feel free to make it.
The hahren is a person, the elders are a group. The keeper is a part of the elders, and the other "leaders of the clans" tend to defer to the keeper and his/her decisions.
Ashalle says that the mother left her clan because of grief. I don't doubt the Dalish Warden's mother died during childbirth(ie "stricken with grief, held out until childbirth, but couldn't go on without Mahariel's father"). But the Dalish of that same clan say that Merrill left of her own will and is becoming a danger to the clan, not that Marathari kicked her out of the clan. So I have no doubts that saying the Warden's mother left of her own clan of her own accord is as much revisionist history as the Merrill thing. Kind words to continue the oppression of non-mages and keep them brainwashed.
The actual dialogue pointed out that the hahren frowned on the union. The specific words used by Ashalle were that the hahren didn't "approve of the match". The father died because human and elven bandits killed him, the mother gave birth, and then she left in despair; that's basically all that's said by Ashalle. You and Mister JB, however, decided to substitute some of these facts for information that came directly from your own imaginations.
Please don't try to justify the fact that you substituted your conjecture for fact. You and MisterJB injected your own speculation and pretended as though it was fact (like your "claim" that the mother was kicked out), which I don't appreciate.