A/N: Okay, you guys, this was partially inspired by Teen Freak's Drabble Therapy, who first planted the what if Ozai-and-Hakoda-met scenario. The 'grandbabies' part is just pure grandfather love. :p
"…Peasant."
"Tyrant."
"Filthy unsophisticated barbarian."
"Cruel sadistic dictator."
"I seriously cannot see what my son sees in your daughter."
"Yeah, well, I don't get why the hell my daughter's all over your son."
"Then it's settled. Our children are idiots when it comes to terms of love."
"That's probably the only point I'll ever agree with you on."
"I hope you won't act as uncivilized as this at the wedding, Hakoda."
"Actually, I'm hoping there won't be a wedding at all."
"Ah." Glare, pause, crafty smile. "Who did you send?"
"My son, Sokka. He's even more protective of his sister's innocence than I am."
"Tell him to contact my daughter. She has some very good pointers on ruining people's happiness."
Awkward pause.
A sigh. "Except…I was hoping to have some grandchildren this year. Spirit knows I've waited long enough."
"Yes. Those two will produce a lot of beautiful grand babies for us, won't they?"
"And of course, I'll be so proud when I take Hakoda-Junior out—"
"Hakoda-Junior? They will definitely name their firstborn son after me, you filthy peasant!"
"Yeah, after the guy who put a scar on his son's eyeball? Not very likely, pal."
"Why you impertinent little—"
"You narcissistic assh—"
"Dad!"
"Father!"
"Eh, Katara?"
"Zuko?"
"What are you two—er, youngsters doing here?"
"Dad, why is Sokka trying to hack off Zuko's head?"
"Wait...Sokka hack off my son--YOU SENT HIM TO ASSASSINATE MY SON?"
"I SAID I WAS GOING TO STOP THE WEDDING; I DIDN'T SAY HOW!"
"YOU SENT SOKKA TO ASSASSINATE ZUKO?"
"Well, assassinate is such a—"
"YOU SENT SOKKA TO ASSASSINATE ME?"
"Look here, young man, where I come from, elders are taught to be respected and I will not—"
"We're leaving, Zuko, and I swear on your great-grandfather Sozin's grave you will never have to come in contact with these filthy—"
"Hey, watch who you're calling filthy—"
"Dim-witted fool!"
"Evil withered crone!"
"Aang, do something!"
"What? I was just walking by and—"
"You're the Avatar, aren't you? Now go make our dads make peace!"
"But I—"
"Zuko!"
"Katara!"
"Dad!"
"Father!"
"Oh spirits, not again."
A/N: In case you were wondering, Zuko and Katara had a girl. :D