Yes, I’d say a sixteen year old does not need to be left by himself for that long. Maybe you have relatives who could stay with him...his grandparents, aunt and uncle?
You’ll be glad for it. Or either cancel your trip.
Relatives are one possibility we are looking at. So is the possibility he spends the week staying at a friends house - the friends parents have offered.
We’d prefer it wasn’t happening as it is - he goes to boarding school and school holidays are precious times for us to be together. But some commitments are very important.