What are the challenges for a man with only one arm and no legs, looking after a very active little boy? “He’s crawling a lot more and jumping about, so changing a nappy is getting difficult. I get frustrated with that. I used to have a plastic arm but I got advised not to wear it around the baby in case it malfunctioned and injured him. My daily life would be easier if I had that, but I don’t want to risk hurting William.” They share the same mop of thick, black hair and the same proud look.