<Tr> <Th> Family </Th> <Td> Luther McDonald (father; possibly deceased) Mrs. McDonald (mother) Country Mac (cousin; deceased) Brett (cousin) Poppins (pet dog) Frank Reynolds (adopted father) </Td> </Tr> <Tr> <Th> Religion </Th> <Td> Roman Catholic </Td> </Tr> <P> Ronald "Mac" McDonald is a fictional character on the FX series It's Always Sunny in Philadelphia . Mac is Charlie Kelly's childhood friend and Dennis Reynolds's high school friend and later roommate . </P> <P> Mac is a co-owner of Paddy's, the self - proclaimed "Sheriff of Paddy's", and is generally the pub's most active manager . Mac is played by Rob McElhenney . </P>

Mac's dad it's always sunny in philadelphia