Where to Stay?

We are planning to visit my brother working in UK. Our family who will join the trip will be around 15 members. This is really a big group! The first problem comes out is where we stay? My brother suggests that we can stay in Birmingham Hotel. Because there are more than 25 restaurants and he can easily bring us enjoy quality meals. But my elder sister prefers Manchester Hotel where she wishes to visit those upmarket and designer stores. After that, my father said he wants to stay in London Hotel so that everyone can shop and he can meet his friend staying there. Oh my! This is really a big problem planning a trip with too many ideas and suggestion....