I don't own Animaniacs.
This is my head-canon on why the Warners built a new castle by Acme Falls at the end of Wakko's Wish.
The throne room was smaller than Yakko remembered, or maybe it just felt smaller because Yakko had grown. There used to be two thrones in here, one for Mom and one for Dad. Salad-Bar's throne was not the one of the thrones used by King William and Queen Angelina. Yakko distinctly remembered his parents' thrones having the Warner family crest on them, and his dad's throne had armrests. One of those armrests had teeth marks on it, a result of a teething and hungry Wakko.
One of Yakko's earliest memories had been in this room: he was not quite three, and Wakko and Dot hadn't been born yet. His father sat in his throne, and Yakko asked him a question.
"Daddy, why do you always wear a bathrobe?" Yakko pointed at his father's loose red robe.
"It's comfy," William had said. "Besides, no-one's going to tell me what I should wear."
"Except for Mommy," Yakko chirped. "She never wants you to wear that plaid shirt."
William had laughed at that. Yakko liked how his parents would laugh at things he said, instead of scolding him for being cheeky, as his nanny often did.
Wakko briefly had a feeling that something about the throne room was familiar, though that memory wasn't as clear as Yakko's. Wakko thought he could remember biting a throne's armrest. That had hurt, and he'd started to cry, before large hands gently picked him up and soothed him.
Dot remembered absolutely nothing, and it made her angry at Yakko.
"Were you going to keep this a secret for our entire lives?" she demanded. "You remembered who our parents were, and you never told me or Wakko? How many other secrets are you hiding, Yakov? That's right, I got a look at your birth certificate!"
Wakko gave Yakko a puzzled stare.
"Your real name is Yakov?"
Yakko shrugged.
"I was named after some ancestor. There's a story about him, but it was so boring that I didn't bother to remember it. When I was learning to talk, I couldn't pronounce the letter v very well, so I ended up calling myself Yakko, and it stuck."
Wakko rubbed his forehead.
"So, Dot was named after Mum and you were named after an ancestor, but who was I named after?"
"Dad called you Wakko because it rhymed with Yakko," Yakko explained, "and your middle name is William, after Dad. Dad liked alliteration, but Mom thought it was kind of silly, She wanted to name you Richard."
"Richard?" Wakko repeated, as if it was the worst name he'd ever heard. "I'm glad that I'm Wakko."
Throughout this, Dot had kept on ranting (with a few frustrated swear words here and there).
"Are you done yet, Angelina?" Yakko asked calmly.
At the sound of her real name, Dot stopped and looked uncharacteristically meek. She quietly said, "Uh huh."
Yakko put his arms around both of his siblings.
"Now that Salad-Bar's out of the way, I'll tell you lots of stuff, starting right now."
Yakko spun around until he wore a tour guide's uniform, and he also summoned a golf cart. He gestured for Wakko and Dot to hop on, and they did.
"Okay," Yakko said, "please keep your arms legs, ears, and tails inside the cart as we're moving, thank you, and no smoking at any time."
Yakko and Dot looked pointedly at Wakko, who literally had smoke coming out of his ears, for no reason in particular.
"Sorry," Wakko said. He rolled around on the floor until the smoke went out, then jumped back onto the golf cart. They started to move.
"Can we got to the kitchen, first?" Wakko asked.
"Please hold all questions until the end of the tour," Yakko said, smirking a little. "Also"-he held out two pieces of paper-"please sign these waivers that state we are not responsible for any unpleasant flashbacks. Thank you."
Dot signed her name and hoped Yakko wouldn't be doing this tour thing for the entire story. It had the potential to get old fast.