It's usually very painful when people fail to redeem promises. That's why it's good to offer any assistance or support on a surprise because when you openly promise , you're giving the expectant a rising hope that the promise will be fulfilled. The person will feel very disappointing and sorrowful is promise failed to show up. Sorry about your uncle's failure to fulfil his promise to you, that shouldn't be strange, that is the usual behaviour of most uncle's in this clime. Your writing is well organised, wish you success in the contest