The Marshalls have a cat that is no trouble. In book #45, it is revealed that they cut back on their housekeeper's hours, so they need baby-sitters again. They are friends with The Phillips.
The Marshalls' house is described as having a swing & a slide in their backyard. To the left of the entryway is the den with the living room off to the right.
The bedrooms are located upstairs and straight from the entryway is the kitchen and the laundry room.