Arrived at parents house for Christmas. House is so hot I struggled to sit in living room (27oC) and started to feel a bit ill so went up for early night. Young DS was still awake looking hot and saying he wanted some 'fresh air'. Now considering how to handle rest of the week, DF is on blood thinners and feels the cold so insists on cranking the heating up, But is sat there in not particularly warm clothes. DM is upset I can't/won't sit with them. Who is being unreasonable here?