I am going to continue writing this story.
I've changed some dates and ages. James and Lily finished school in 1977 rather than 1978 and Lily was pregnant before she Graduated.
Bill- 29th November 1972
Charlie- 12th December 1974
Percy- 22nd August 1976
Fred and George- 1st April 1978
Rory- 20th November 1977
Harry- 31st July 1980
Ron- 1st March 1980
Ginny- 11th August 1981