Locations to meet family along JMT?

I am planning a thru North to South hike of the JMT next summer. My wife and younger kids are planning to car camp while my oldest son and I backpack. Does anyone know of places near and accessible to the trail where I can hook up with them along the way? I have looked up information regarding the resupply points and am interested if anyone has used these places for such a purpose and if there are additional locations we could plan on. We planned a similar routine this past summer along the first 400 miles (S to N) of the AT and were able to hook up every 4 or 5 days. Just wondering if we'll be able to do it on the JMT. Thanks!