I didn't know this topic was still alive.
Astor doesn't need a bunch of siblings, heavens no. Granted maybe it would help with his I'M THE FUCKING EAGLE EMPEROR BITCHES BRING ME APPLE JUICE AND CHICKEN NUGGETS attitude if he had to share his Dad butler. Hubert jumps up every time Astor makes a peep, basically. He would have had one sibling, but Edelgard's crest implant was attacking her system by that time so the sibling was miscarried. Yeah.
Right, so...wolf pups? I might have to think of some. Constance sounds most likely to want to pair up and have kids on purpose. Gotta revive house Nuvelle.