Harry Potter Next Generation Troubles

This is my attempt to expand on the next generation of Harry Potter.
Most time travel fics I read begin quite suddenly and I just thought it would be fun to do some backgrounds and stories.
Ages and houses:
23-teddy(H)
21-vic(H),molly(r)
17-Dom(r),lucy(s)
15-james(g),fred(g),roxy(g),louis(g), alice(h), Lysander(g), lorcan(h)
13-Albus(s),rose(r)
10-lily,hugo
Feel free to correct my mistakes, English is not my first language.