ninathenana - my youngest granddaughter, when she first got paid from her place of work, rang me up and said 'nanny, shall we go for a Costa Coffee - I'm working now so I can pay'. She knows I love Costa Coffee and I thought this was her way of saying thank you for all the times I've taken her and her sister out for lunch, dinner, ice creams, etc etc. We ordered our drinks and I stood aside thinking how grown up she will feel paying for my coffee and her ice cold thing. She said 'you go ahead nanny, as I've said, I'm working now and I can pay for my own' 
She obviously shares my brother's mantra: nobody gets rich by spending it!