Oswald's Son - S5.E21

A 21-year-old man claims to be Oswald's son, the result of a fling at a summer tap dance camp. However, the man bears a striking resemblance to Lewis. Lewis admits to Drew and Kate that he also slept with the girl. He believes that he must be the father, but Oswald argues that Robert actually looks like his mother. The guys arrange for separate outings with Robert, but begin bickering about ""custody"" issues. They finally decide to take a DNA test to find out which of them is the real father. Robert reveals that he is married and has a child of his own, and finally sought out his father because the baby doesn't have a grandpa. He is perfectly happy to have Lewis and Oswald share father/grandfather duties, so they decide to save their friendship by tearing up the results of the paternity test. Meanwhile, Drew's decision to allow the employees to put together the store newsletter proves disastrous.