I think that "Shannis" is the best relationship to be featured on EE for a long time. It shows a sensitive, caring side to Dennis and brings out the fun side in Sharon.
It's going to cause loads of friction in the show and I think that's great.
Sharon is Den's adopted daughter, and her and Dennis aren't technically related. They haven't grown up together and I see absolutely nothing wrong with it!
Here's to Shannis, long may it continue!
PS: The Miss Piggy and Kermit the frog comments are just plain rude! Get some manners!