Mr Large is taking Mrs Large off out for the day for a relaxing picnic, so Granny and Grandpa come round to look after the children.
But after the parents leave, disaster quickly strikes ... twice!
Grandpa kicks a football through the living room window and forgets to mind Lucy.
Then the bath overruns as they all take Grandpa to the doctor.
Mum and Dad return to learn the children were good as gold – but Grandpa is in trouble!