Mark Grayson isn't Asian. The creators of the comics have established his ethnicity as something other than Asian. This is a well-defined aspect of the character's portrayal.
Hard to say. To determine if it's a true story, we'd need to know more details about the origin and sources related to Jennifer Grayson. Sometimes stories are inspired by real life but have fictional elements added.
Mark Grayson isn't Asian in the comics. This aspect of his character has been consistently portrayed throughout the various comic storylines and depictions. There's no indication of him having Asian ethnicity.
As I don't know the particular Jennifer Grayson story, I can't say for sure what its significance is. It could be significant to her family and friends if it's a personal story of growth or recovery.
I'm not sure if the so - called 'Grayson Dolan gay story' is true. There could be a lot of rumors floating around in the media. Without reliable sources or statements from Grayson himself, it's hard to say for certain.