Sports, after-school clubs, hobbies, jobs, and hanging out with and telephoning friends, pose the practice problems. If there is more than one music student, scheduling becomes more difficult, but never impossible. Work out a compromise. In your family conference, make it clear to all family members that music study will required effort on everyone's part. At times, there might even be inconvenience.
Someone has to drive the child to lessons, to the music store, and to other music activities.
Someone might have to assist actively with practice. Furniture may have to be moved. The daily schedule must be arranged so there is quiet during practice time. Solicit a positive attitude from all family members. For example, an older brother or Father should not chide your young son about his desire to study music.