The Moffats by Eleanor Estes

The Moffats are a fatherless family of four children - Sylvie, Joey, Janey and Rufus  - who live in a small town in Connecticut. The four book series focuses on stories about the two youngest, ten-year-old Janey and five-year-old Rufus. Estes based the novels on her own experiences, growing up in a working class family during WW1.