I know it does sound weird..I want to go back and read the interview with the dad again..maybe I am remembering wrong..
You are thinking of the Daily Mail article. I thought the same thing as it was one of the early reports but it could be that Daily Mail got it wrong. It looks like the whole family is right there next to Martin in the photo. Mom, Martin, lil sister, bigger brother and dad behind Martin and lil sister. http://imgur.com/a/fEZhX