The first step is to decide what kind of home will suite your families lifestyle.
Create a 'Must Have List' and discuss this list with all family members, including children.
Anticipate potential changes in your family's lifestyle and size, children, extended family, grandparents moving in, and these days the growing trend towards working from home.
Secondly, decide what location will be convenient for all family members, taking into consideration schools, shops or extracurricular activities that are important to all of the household members, and how long you intend to live there.
Thirdly, define individual priorities. Decide what are the privacy and needs of each family. Keeping in mind the needs of children change dramatically as they mature. Privacy and their own space do become a priority especially during high school years.