are sibs tickets unique to the individual?

Don’t think so. On the ticket you have to fill out your name & address (at least the one I have). I guess at that stage it becomes personal but they’ve never checked my details (I suspect it’s about capturing marketing info)
 
No, they're scanned at point of entry to stop them being used twice. Otherwise, as stated, you have to fill in the marketing blurb but I sometimes fill in something random...

yes, I remember now from last year being made to fill it in. Thanks guys. Mickey mouse it is then
 
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