Excellence!!
Rob, you have just outdone yourself again with this follow-up to Don't Wake Robby. Plus, this is the first Siblings cartoon that has more than you and your family doing the voices. Now, if only Baron von Brunk finished up his current projects, I would be completely satisfied for 2010's flash comedy quota. Other than that, on with the review...
Art and animationwise, it's still the same as the other five, but I also have noticed the additional locations and that awesome-looking dream sequence you did. This, in other words, shows that you've improved in your directing quite a bit. If you keep working on your directing, you might be up there with Adam Philips (Bitey and Hitchhiker), Doug Sauncy (Keegan's Truck), Sangmin Bang (Gunchest), and Em Kaah (Goldilocks). The sound quality is still another one of your strong points with above-average recording quality and great voice acting. Plus, as I mentioned before, I like how you got more people doing voices in this one, such as Oney for example (even though I ignore Grand Theft Awesome and Left 4 Speed). There's a difference between compressed sound (smaller file size) and crappy recordings (big size, but hard to make out). As for the humor, it's just as funny as the other episodes, and the aforementioned dream sequence was very imaginative. However, my only gripe is the file size (Ten Megabytes is a bit much for those still on narrowband connections).
What I do like:
-Funny
-Above-average art and animation
-Great directing
-Top notch voice acting
-The dream sequence
-Original subject, but that takes a backseat position to the actual product
What I don't like:
-Huge filesize might put off those on dial-up.
Overall: Here's a well-deserved Ten out of ten for you and Oney. Now if only Siblings had it's own collection/series page on here...