When their father invites a mail-order bride to live with them in their prairie home, Caleb and Anna are captivated by their new mother and hope that she will stay.

Ma and the girls follow Pa west by train where they make their home at a rough railroad camp and plan for their own homestead.

Barbie's family sets up a backyard campsite to try living like pioneers, but when her mother needs to get an important project to work and there is too much traffic for her to get it there on time, the girls come up with a way to save the day.