no, coz it's my son, not her son, kissing is only allowed between relatives.
Please remember, helper is only a worker for you, she is NOT a relative, the relation between you and the helper is only based on money.
Teach your son that the helper is only work here, she has her own family, she would leave when she finish her work and earn enough money. Don't let your son/girl think that she is a relative, or you will face a hard time when you change a new helper, especially, the old helper has been work for quite a long time.