From 12.05 to 16.06 and from 1.09 bis 23.09

Children Free
Up to 6 years (half board or full board).
Second child up to 6 years 50% discount.

Grandparents free on holiday
Each family with children in residence formula, in formula hotel 20% discount for the grandparents.

You can choose from the promotions above but not add them together. 1 week minimum stay.