British tutor for weekends and/evenings

Adrian (12 yrs old) and Louis (10 yrs old) are very diligent multilingual boys looking for a native English speaker tutor to perfect their English speaking/writing skills. They are free at the weekends and some evenings. We live in Trocadero which  very close to many public transport facilities in central Paris. We could provide a room if necessary. British accent, humour and kindness is all we are looking for.