Hey guys, I've been thinking about this for a while and it wouldn't leave me alone so I had to write it to see what you think. I hope you like it :)
This first chapter is all of the kid's names, their house and year. I've had to make a lot of it up because it was never clear what year they were in.

Harry and Ginny's kids-

Lily Luna Potter: 2nd year Gryffindor

Albus Severus Potter: 4th year Gryffindor

James Sirius Potter: 6th year Gryffindor

Ron and Hermione's kids-

Hugo Weasley: 3rd year Gryffindor

Rose Weasley: 6th year Gryffindor

George and Angelina's kids-

Roxanne Weasley- 5th year Gryffindor

Fred Weasley- 7th year Gryffindor

Percy and Audrey's kids-

Lucy Weasley: 3rd year Gryffindor

Molly Weasley: 5th year Gryffindor

Graduated-

Victoire Weasley

Dominique Weasley

Louis Weasley

Teddy Lupin

Any kids Charlie might have had

Wow! I'd say the majority of the Gryffindor table would be taken up by Weasley's :P anyway...

Draco and Astoria's kids-

Scorpius Malfoy: 4th year Slytherin

Narsia Malfoy: 6th year Slytherin (My OC, named after Draco's mother, pronounced Nar-see-a)

Luna and Rolf's kids-

Lorcan Scamander- Ravenclaw- 4th year

Lysander Scamander- Ravenclaw- 4th year

Neville and Hannah's kids-

Scarlett Longbottom- Hufflepuff- 1st year

Sophia Longbottom- Hufflepuff- 1st year

Ethan Longbottom- Gryffindor- 5th year

Seamus Finnegan's kids-

Bryan Finnigan- Gryffindor- 3rd year

Eve Finnigan- Gryffindor- 1st year

Dean Thomas' daughter

Eloise Thomas- Gryffindor- 1st year

Hope this makes thing a little easier! I hope you'll keep reading :)