It’s not hard to do the maths. There’s 12 years between them and when he begins primary school, she will be finishing high school. Although it’s not beneath him to give her a hard time sometimes, there are many, many tender moments between them. She is so good with him. She gets down on the floor to play with him. She is patient and enjoys showing him how to do things. There’s no doubt about it, she’s a big sister in a million!