Wanda's children
When Strange visits Wanda in the apple orchard, he smells one of the blossoms and says it smells real. She promises him that this is very real and he doesn't seem to have any issue with that.
He only realizes that something is wrong when Wanda lets America's name slip.
So how are we still discussing if Wanda's children were real?! The whole thing of the Scarlet Witch is that she can alter reality. She's not "faking" reality. She creates it.
Her children were as real as anything else. They didn't exist before Westview and then they did.
It is the Scarlet Witch's destiny to destroy the world, which means she is one of the most powerful people out there. A being capable of spontaneous creation, as Agatha put it so nicely.
Spontaneous creation.
Now, either Doctor Strange doesn't know that - which I doubt, to be honest - or he doesn't believe it to be true. Which would explain why he realized the blossoms were real but doesn't believe the same goes for Wanda's children, who he has never met.
Either way, this argument should be put to rest.
(And every line cut out of that movie where someone implies her children weren't real...)
