Could you elaborate on Kaeya being Crepus' favoured child?
Do you mean in the sense of, he's more lenient on Kaeya but always has Diluc as his no.1 priority or am I reading this wrong?
I like to believe that Crepus always had high hopes for Diluc, mainly because he's so disappointed in himself. He always wanted to be that knight that everyone looked up to, to have a vision of his own.
Sure, he has a wine tycoon that he maintains, has the love and respect of the people in his community, but it never made him feel like enough. For him, an ideal child would be the one that can be a knight like Varka and a business man like him.
So all of his life he subtly pushed Diluc to being his perfect son. The fact that Diluc is practically his twin doesn't help, he wants Diluc to accomplish everything he'd ever wanted.
When he got Kaeya, it was different. He already had his prodigy and he didn't need another. When he got Kaeya, it was like he was one step closer to being this hero that he'd always wanted to be. He saved this poor boy from the harsh outdoors and became a better father to him than his biological one was.
For Kaeya, he wanted to be the perfect father. For Diluc, he wanted a better version of himself.
