My late brother-in-law was named Maximilian. And, apparently, his Royal Name was going to be Hadrianus, in memory of the third King of Alba who enlarged our borders and established a more fair and precise tax system.
He was blonde, just like I knew, and he had green eyes like the current King and the late one. It was a family trait both sons inherited from their father.
Gratia has her mother's azure eyes but her father's bright blonde hair instead of the Dowager Queen's ash-coloured.
I've also seen the late King's portrait, and he does resemble Ignis except for the hair. The brother, on the other hand, is a mix of his parents' features. His eyes, though, don't shine like my husband's.
Maybe, because it's a painting and not a real person.
However, the little Aestas is more similar to her mother. Except for the green-brownish, browner than green, eyes, that are a mystery. Maybe, inherited from a grandparent or an ancestor on the Princess's side.