Mac. They shared an apartment together until it was burned down in the Season 9 finale "The Gang Squashes Their Beefs". They then moved into Dee's apartment and had to share a bed with an old man as a part of a bet with Frank ("Mac and Dennis Move to the Suburbs"). Their old apartment was rebuilt in Season 12, and both Mac and Dennis moved back by Season 13. Dennis often partners up with Mac for numerous schemes, including the aliases "Honey and Vinegar" as well as selling merchandise for Paddy's Pub together. They also heavily rely on each other in their personal lives, one instance being Dennis having Mac skin an apple before eating it ("Mac and Dennis Break Up"). Despite their friendship, Dennis is often annoyed at Mac, mostly for his apparent attraction to him. Dennis views Dee as inferior to him and is controlling for her, often joining the remainder of the gang in mocking and despising Dee. Despite their sibling rivalry, Dennis and Dee often team up together, especially in the game of Chardee MacDennis, where Dennis and Dee perform exceptionally against Mac, Charlie, and Frank (mainly through cheating and rigging the game). There are also instances where Dennis looks out for Dee, such as when he showed care for her when she gives birth and when he became concerned that she will fail miserably when her stand-up career began to apparently take off. Like his sister, Dennis despises Frank as a father, and was initially reluctant to let Frank join 'The Gang'. After it was revealed that Frank is not their biological father, both Dennis and Dee stopped treating him like a father, rather merely as a member of the gang. Their relationship remained relatively hostile in the earlier seasons of the series, with Frank at one point selling Dennis out to prostitution in order to pay off $25,000 owed to the mafia ("The Gang Gets Whacked"). Over time, however, Dennis begins to partner with Frank more often, including helping him cook up Paddy's books through several money laundering outlets ("Sweet Dee Gets Audited"), teaming up together to buy out a ski resort ("The Gang Hits the Slopes"), and bathing together at Dee's apartment ("Ass Kickers United: Mac and Charlie Join a Cult"). Family In the Season 6 premiere "Mac Fights Gay Marriage", Dennis marries Maureen Ponderosa, his high school sweetheart. After falling out