When Pete, Sue, Ben and Jake come back from the park - it's been raining and Pete says "The British Summer up the Park. Get soaking wet and covered in dog shit!"
"Shit" is used in a few episodes.
One time, Pete says 'Oh Fuck!' in front of his children. This is the only the F Word has ever been used.
B-tch is said in many episodes.
A little girl (about 7) is seen sitting on the stairs telling Karen's parents that her (the little girl's) mum "said the F-word and the K-word".
One episode contains arguing between the mum and her sister, and they're swearing a lot, but then Karen comes down to them (she's about 5-6 in that episode) and says: "What are you doing?" then the mom replies: "Um, we're in a game, the one to shout the stupidest thing wins. Wanna join us?" And Karen says "No thanks." Then they continue arguing.