16 is still a young age and its 'transitional' from being a child,to an adult ( kidults i believe they're called?) So its all new to him,i would imagine,this new world where tutors try to treat them more like adults,yet in the mindset its still 'like school' so maybe his parents see him more as a 'grown up' now,but hes still young and learning,not a grown up at all,they need to give him time to mature into the role,and not expect too much of him yet.But try not to criticize their parenting of him,just 'reminice' over your own son being that way,&" say well he turned out ok"& then your daughter may remember,& stop& think.and ease up on him a bit.let it sink in.