Accolon as best dad I am 100% on board with, but Morgana as best mum? Really? I get that her backstory justifies some of her actions but her unremitting bitterness towards Arthur despite him being the father of her child disqualifies her as best mum in my eyes.
Also, let's not forget that Mordred is not just the product of incest, but of rape. Arthur makes it clear that he never would have slept with Morgana had he known she was his half sister, a fact she knew and concealed from him. Not allowing him all the information needed for him to consent is a type of rape.
First off, it's just my opinion? (I have no idea why we are having a discussion on the comment section right now but oh well)
Second, if i have to explain my opinion, I'm not saying Morgana is a good person (hell no she is not no matter what past she may have had) but as a mother she is 100% a good one. Granted she may not be perfect what with her bitterness (part of it being: no matter the circumstances, arthur just abandons and doesn't even show up his face to his kid in years and somehow later he has a change of heart and wants to be a father to the kid? hell no! it's bad and destructive for the child's psychological health (she thinks she is protecting her child like any other mother on the planet would)) but she neither abandons her children nor does she fail to show her love for both of them every single time. An imperfect but passionate mother who will do everything for her children.
In the end, you have an opinion and i have an opinion. i don't impose my opinion on you nor should you impose your opinions on the story to me (i'm not saying you are but i'm writing this just in case).