If Will would be a single dad, Mrs. Afton would need to leave sometime (or right after) Chris' birth. I don't wanna pair Willy with another women to get one more child

(what i mean by is Vanny and Lizzy both look alike, I want Vanny to have Mrs. Afton's appearance and Vanny being the oldest child yes.)

And Chris being the youngest and is based on Will is fine by me.

so how bout this:

Mrs. Afton left like, when Chris was four months old

which makes Vanny 10 that time, Michael 8 and Lizzy 4

:/