How to make sure my helper is a good educational influence on our baby?

I ask my helper to sing nursery rhymes for my little girl and read big alphabet books with her....she see that I always do it when I at home she learn and do the same... my helper also teach my 3 years old when he's at home if he never go childcare how to write numbers and alphabet and read books to him.... I also ask her to on educational show for them... I will print matching colouring and shapes worksheet she will do with them....