Hi. This story will have 3 chapters. I think. One for each kid.
"Oh my goodness, I hope she's alright, I do hope the baby's okay!" Minerva McGonagall, headmistress of Hogwarts, fretted, pacing the length of her office.
"Minerva, it will be fine. Mrs Potter will live through the birth, the baby will be fine, and in 11 years we'll have another Potter running around the school causing mischief." Albus Dumbledore said calmly.
Severus Snape grimaced. "Merlin help me. Potter's offspring will be coming to Hogwarts."
"Now Severus, I'm sure the child will be lovely." Dumbledore smiled serenely.
All 3 of them jumped in surprise when they saw Harry Potter's head appear in the fireplace.
"SHE'S HAD THE BABY SHE'S HAD THE BABY!" He shouted happily.
"Is it a boy or a girl?" Minerva asked excitedly.
"It's a boy! And we've named him James Sirius Potter!" Harry announced joyfully.
"Joy. Another James Potter." Severus scowled.
"Oh that is lovely!" Minerva gushed.
Albus nodded. "It will be nice to get another Potter in the school."
Harry said goodbye and popped back out of the fire to get back to his wife and child.
"James Potter is coming this year." Albus said with a beam.
"I can't wait! He'll be such a pleasant child considering who his parents are." Minerva said.
Severus snorted. "He'll be the devil incarnate."
Minerva scowled at him. "Students used to call you the devil incarnate."
Severus glared and stayed silent.
"Goodbye Albus, Severus, I need to watch the sorting." She walked out with a big grin on her face.
Minerva came storming back into her office a few hours later muttering about 'bloody annoying Potters'.
Severus looked hugely entertained. "What did it do?"
Albus threw Severus a reproachful look, and asked, "What did hedo?"
"Made the staff cluck like chickens when they spoke, and made the students act like monkeys. The spell hasn't worn off for the students yet, and they're hanging off of the chandeliers!" Minerva growled angrily.
"I told you so." Severus said smugly.
"Well that sounds eventful. And very powerful magic for an 11 year old." Albus grinned.
"Yes, well, he is Harry Potter's son. And James Potter's grandson."