jude: I believe Derek said he was 13 when his father was murdered. I do not think Derek is the oldest. His birth order has not been stated but I got the impression that at least 2 of his sisters are older (Nancy and Kathleen) maybe because of them checking up on him (Kathleen sent Nancy) and being so protective and controlling. I think Nancy is supposed to be pretty close in age to Derek. There is another sister that nothing has been said about except that she is a doctor as well. She could be either older or younger than Derek. I assume Amelia is the youngest unless the mystery sister is younger.
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