Home Bathrooms How many bathrooms should be there in a house for seven members?

How many bathrooms should be there in a house for seven members?

I have given an assignment to contractor to build a beautiful house for me and my family. We are seven members in total who will live in that house. I want to know how many bathrooms should be there in my house. There will be four bedrooms and one hall and kitchen. So what I want to know is if I will construct one attached bathroom with a room will it be sufficient. Or should I construct extra bathrooms?