My sil is separated from her ex partner they have a little boy. Mum likes the kind of surfer boy look for her son, he has longish hair, Dad prefers short hair has asked her a few times to get his hair cut. Kid doesn't care, he's 3. So he's come back from the weekend at his dads and he has had his hair cut short. My sil is very upset but her ex partner says hes done nothing wrong as he is quite within his rights to get his sons hair cut. What are your thoughts?