[Irkalla]

Spoiler for spoiler 1:

The Maker was/is the first blood mage.

Spoiler for spoiler 2:

Morrigan is Alistair's sister.

Spoiler for spoiler 3:

I'm only half kidding, I actually believe both are very plausible. Maric could have slept with Flemeth in The Stolen Throne and it's logical that the Maker was/is just some kinda powerful mage, the irony abounds.