You would be better getting the Sienna. The Highlander will seat 4 adults comfortably and a small fifth person on the middle seat second row but I wouldn't want to be that 5th person. Third row will seat two small children but that's it.Wondering how many people put 5 or more adults into their highlander? I am looking at getting a family car with a 3rd row without getting a Sienna. Just wondering how the comfort of the Highlander is.