Benefits of creating a Microsoft account for everyone in your family
By creating a Microsoft account for each family member, you can then create an Xbox profile that allows you to personalize each person’s experience. You can add content restrictions for kids, or start a family competition and give each family member his or her own gamerscore.
Parental controls on the Xbox (360 | One ) are set at the account level. Parents and caregivers can give teens more freedom on the service while still maintaining age-appropriate boundaries for younger children.
Restrictions placed on child accounts follow your children no matter where they sign in to an Xbox. You always have control over what your child can see and do.
The visual experience on the dashboard can reflect each family member’s personality. They can choose their own colors, select their own gamertag and gamerpic, and specify which apps they want to pin to the account home page.
Everyone has his or her own achievements, gamerscores, and friends that they can take with them when they use their profile at their friend’s house or anywhere else.