Maureen's two children have left home. her daughter is going to college and her son is getting married. now that the children have left, maureen and her husband have a household that is called

The correct answer is empty nest.
Their 'nest,' which is a metaphorical way of referring to their home, was full while Maureen's children were still living with her and her husband. However, the moment both of her children moved from their childhood home, the nest became empty because the children no longer lived there.