This started off for a game, but I've split it off as its own project, only using the name of the reigning Monarch for the former anymore.
I have'ntt updated it in awhile; I need to add about 3 generations, but anyways, it's good enough as is to post.
The first four generations were born under the original Imperial Charter, which was highly restrictive in who was considered a member of the Imperial Family, with the children born of those not the Empress/Crown Princess being considered outside of it, however starting with the fifth generation a new law came into effect that essentially created a system where all the 4G Empress's descendants were part of the Imperial Family.
Oh, and yes, Prince Azuro and Prince Yamato were brothers, who were also lovers, and yes Azuro married his brother AND an unrelated* woman.
*Same-sex incestuous relationships are fine, however the Imperial Order explicitly forbids marriage between straight couples if they're both members of the same Imperial line as well as highly discouraging (to the point it's never happened) marriage and childredn between those within the overall Imperial House.