Photograph: Alessandro Biascioli/Getty Images

My son is nearly 15 and my only child. His father and I separated some years ago and they see each other regularly. My son also has a good relationship with my partner, who has lived with us for a few years. He has always excelled at school and is a talented musician. When he was younger he was confident and eloquent beyond his years; he could make friends or have a conversation with anyone.