Is it okay for my son to share room with the maid?

My three-year-old son prefers to sleep in our househelp’s room rather than his own. She is a very hardworking and reliable maid and has brought up our daughter, who is now nine years old, as well. Both my children love and appreciate her very much. My husband and I have demanding jobs and thus have to rely on outside help to raise the children. If he were a girl I wouldn’t worry so much, but I am concerned about this attachment. My husband thinks we should fire her and get someone else, but I would really feel guilty about such a decision. Are we being too paranoid as parents?

Hannah, Nairobi