I feel for your frustration. It's something most of us go through while waiting for news from the UKBA.
Looking at your schedule I'm afraid its very unlikely that you will make your holiday... yes, I know that's probably not what you want to hear but I'd suggest rather than depress yourself over this missed opportunity you look forward to happier times when eventually your FLR is finally granted.
Having said all that, and as you said yourself, it could still happen. So keep your fingers crossed.
Meanwhile, are you aware that you 'could' request the return of your husband's passport (assuming he's the sponsor)? It would mean that unless your application is settled you wouldn't be able to join your family on holiday but at least the kids won't miss out. Again, its not the ideal solution but it is making the best of the current situation. And yeah, it'll be horrid sat at home alone but a brief time apart will make those time together all the more special.
Stay positive.
![Smile :)](./images/smilies/icon_smile.gif)