Do you have a flat or annex you would be willing to let in the Kingston on Thames area in exchange for low rent with housekeeping duties/pet care/help with grandchildren?

My son and daughter-in-law have returned from working in Africa and he has just been employed in Kingston on Thames. My daughter-in-law would like to undertake some live in work for an elderly person or people as they are finding flats in the area beyond their means. She is entirely honest, hardworking and delightful. I think my son is too, but perhaps I’m biased in that regard! Does anyone know of a scheme or agency that could match them?