<Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 20 </Td> <Td_colspan="1"> September 13, 2015 (2015 - 09 - 13) </Td> <Td> June 19, 2016 (2016 - 06 - 19) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 15 </Td> <Td_colspan="1"> September 23, 2016 (2016 - 09 - 23) </Td> <Td> March 24, 2017 (2017 - 03 - 24) </Td> </Tr> <Ul> <Li> Dove Cameron as Liv and Maddie Rooney </Li> <Li> Joey Bragg as Joey Rooney </Li> <Li> Tenzing Norgay Trainor as Parker Rooney </Li> <Li> Kali Rocha as Karen Rooney </Li> <Li> Benjamin King as Pete Rooney (seasons 1--3) </Li> <Li> Lauren Lindsey Donzis as Ruby (season 4) </Li> </Ul> <Li> Dove Cameron as Liv and Maddie Rooney </Li>

Who are the actresses that play liv and maddie