Enid Blyton 
Six Cousins at Mistletoe Farm 

After a fire at their home, Cyril, Melisande and Roderick are hastily sent to stay with their aunt, uncle and cousins on their farm. The three arrivals are somewhat spoiled and affected, and find it very tough to live on a working farm with their cousins Jane, Jack and Susan who have their own faults. Sensible Aunt Linnie helps the cousins to fit in a little and even the home cousins learn a thing or two.