Native English to play

I’m looking a native gril or boy for the first week of July (5 to 9) in Madrid to speak with my 5 kids (13 to 7 years old) form 1 PM to 5 PM… 20 hours 250€ 
The idea is lunch with us, play with them in the swimming pool or doing games, crafts.
We are living near Le lycée Francais Conde de Orgaz (Esperanza)