My step kids are lazy and rude to me!?

They're nice kids overall. However, their mom has no job or hobbies and caters to their every whim. She also lets them speak to adults disrespectfully, and they have no chores around the house. They're with us half the time and no matter how we try to guide them, they're straight up lazy. We only ask that they keep their hockey sticks and pucks in the play room, and put their dirty dishes in the sink (that's it!!!)--and they won't even do that. We feel like broken records, but I'm really tired of constantly picking up after them, and having them talk to me disrespectfully. Help!