RoseandJoan I so absolutely understand how you feel!
I agree with Debora that sometimes family members can be the absolute worst when it comes to considering the feelings of others. I hope my own little 'sibling' story below makes you realise you are not alone feeling this way....
I had a fairly similar situation where my brother broke my microwave. (Well, to be entirely acurate, he literally managed to blow it up! You should have heard the bang!) This appliance cost me multiple$$s and absolutely positively was his stuff up!
Whilst being a tad embarrassed, ("Ooopsies, sorry!") he did not offer once to either replace it or help fix it (and he was staying with us from interstate, so it wasn't just a casual, common 'visit').
I was, frankly, amazed and saddened by the fact that someone with the same parents, knowing that I am at home with three little kiddies (so basically a single income family) could have this attitude. Did he somehow think money grows on trees for us, but not for him?
He also has not repaid money to me (twice!) which was meant to be "his" contribution towards a gift for another family member, despite me asking numerous times. Bluntly.
My hubby and I decided that the possible ensuing war that could occur over a couple of hundred dollars was not worth it - even though it felt very unfair and tough to take, given our own financial circumstances at the time.
I guess what I've learnt is this - Yes, I do love him and despite all my comments to the contrary above, he is a nice person and a pretty good brother. Yes, it has changed my opinion of him - but that is life really - people we love sometimes change for the worse and sometimes they hurt us or can be very inconsiderate.
I have, also learnt that when it comes to anything that could have possible ramifications for money where he is concerned, it is the very best to keep the two very separate. And hope the next time he visits, he doesn't blow up yet another appliance - next time I won't be so forgiving or noble! (I guess the whole "Fool me once, shame on you/ fool me twice, shame on me!" principle kicks into gear then.)
If overall your sister is a good person who you get along with (like my brother), I would probably be inclined to let the money and this situation go this time. The possible 'nuclear family fallout' really isn't worth it.
I hope maybe my similar experience helps you feel just a little less alone in feeling angry and cross and hurt and frustrated and ... well...... just plain MAD by siblings "behaving badly"!