Why did in the Bee Gees' family, the younger sibling died first instead of the elder one first?

We all know that in the Bee Gees family, Andy, the youngest of the Gibbs, died first, then Maurice, then Robin. Whats the genetic defect that causes t

We all know that in the Bee Gees' family, Andy, the youngest of the Gibbs, died first, then Maurice, then Robin. What's the genetic defect that causes the younger one to die first and not the elder one who usually dies first?

or:We all know that in the Bee Gees' family, Andy, the youngest of the Gibbs, died first, then Maurice, then Robin. What's the genetic defect that causes the younger one to die first and not the elder one who usually dies first?

or:People of all ages die all the time. It doesn't matter which sibling is older.

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