Home Alone 4 should really be, probably, the year after Home Alone 2 despite the set dressing and age of Kevin, since it's a sequel to that film.
In my personal opinion:
1990 - Home Alone
1991 - Home Alone 4
1992 - Home Alone 2: Lost in New York
1997 - Home Alone 3
2012 - Home Alone: Holiday...