No — all family members do not need to ski together when using Chamonix ski passes.

Each pass is individual and non-transferable, which means:

• Everyone can ski or explore at their own pace, on their own schedule.
• You can split up across different ski areas (e.g., one parent at Brévent, another at Les Houches).
• Pedestrian passes (for non-skiers) also work independently for sightseeing lifts and access to viewing areas.

This flexibility is perfect for:

• Families with different ability levels
• Parents taking turns with young children or non-skiers
• Multi-generational groups who want custom experiences

Just make sure each person carries their own pass and has scanned in at least once in Chamonix (for Mont Blanc Unlimited passes to work in partner resorts).