My dsis is 18, she's the youngest sibling by over 10yrs. My DB and I have the same dad who sadly passed away, then dm remarried s-dad and had dsis. Although dm and s-dad are now divorced, we still see him as our dad even though his only bio child is dsis.
Since the divorce (11 yrs ago), I feel (maybe wrongly, not sure) that dsis has become a bit spoilt through being the only child left at home and also due to guilt from mum and s-dad. Examples include being bought a new top-of the range mobile after losing one she was bought a week before, having a strop and wrecking her room then getting bought a new bedroom furniture set. Wanting to buy big things (brand new car, designer dog etc) but borrowing money instead of saving up then refusing to pay parents back when other costs arise like insurance etc, despite showing off on fb with pics of her large designer trainer collection! Refusing to pay board despite working full-time.
Anyway, she wanted to go to a concert but was working when they were released so asked dm to book and pay for it. Not sure why she couldn't leave dm her debit card but never mind... Dm didn't have enough money on her card to do it so asked her DP to book and pay, which he did. To complicate things though, the company would only post to his billing address which he'd just moved out of (in order to move in with mum and dsis), he hasn't got round to changing the address. He told dsis and said she'd need to go to the address and get the letter (it was sent signed for).
As you can probably guess, dsis didn't bother to get the letter when it was delivered on 1st April, and has moaned non-stop about not having her ticket since then. She then decided that 4 days before the concert, she'd start a mission to get the tickets back. To cut a long story short, they have been returned back to the sender but have somehow got lost. This bit is pretty complicated and Royal Mail have admitted liability and are offering compensation for the full value of the ticket.
However, dsis has looked at replacement tickets and as it is only 4 days to the concert, the price has gone from £70 to £150. She is now going mental and saying that Royal Mail should give her £150 instead of £70 but I seem to be the only one who disagrees.