DH wants to visit his mother and sister at an outdoor venue near them. Takes an 1hr and 30 minutes one way on a very busy and congested motorway. We will then be out all day with DC 18 months and 4. Forecast is 27 degrees. I think they are mad and saying it's not fair on the kids, given the travel and the heat. They are more than welcome to ours. DH thinks i am being unreasonable as they always travel to us ( errr because we have young children). AIBU? WWYD?