My stepson is going to be 13 this year, and lately past couple of months he has been really disrespectful and lies a lot. He will lie over simple questions, like if he brushed his teeth.... he will lie and say he did. It got to where I knew he was lying, he didn't even go into the bathroom. I have called him out on his lying, along with his father... my stepson backs his lies and continues to lie and claim he did.

Another example so you can understand a bit better, he has a cat that is his responsibility (feed him, give him water, change the cat box). We write down days to change the litter box and even will remind him to clean the cat box multiple times. We will ask him if he changed the cat box, he says yes. I used to leave him alone when he says yes and believe him but it got to where the cat box smells up the house. I check it, it'll look like it hasn't been cleaned in a week. Now, everytime he has to clean the catbox I ask him,  he will say yes and so I check the cat box every single day. Currently, I remind him to clean it and before bed I'll ask him did you clean the cat box. He will tell me yes, I'll go check and you can see it hasn't been done. I'll ask him is he sure because the cat box doesn't look like it has been touched and piled up. He tells me yes and that if I want to check to go look in the trash can. Being me, since he lied so many times I go to look in the trash can. No litter or anything in there. I'll ask him again, and he will tell me maybe it's at the bottom. I'll look, no sign that the cat box has been done. An he will look me straight in my face and tell me "I don't know why it's not in there, I cleaned it." 

He lies about damn near everything even the littlest things (like again teeth brushing). He even lied about his homework, which during conferences found out he does have homework and told his teacher he's not doing it. Of which she told us and he said he never once said that. 

The disrespect goes as far as lying, giving an attitude about responsibilities, and even not following house rules (even having friends over). He gave his bus driver an attitude one day because he was mad too, and we had to discuss with him that's not okay..

We tried to take away his phone, his Xbox, have a discussion with him, and it got to where we yelled at him. When this happens, he stops lying and being disrespectful then a couple days later goes right back to it. I'm hoping for advice or even some consequences other parents have tried with their kids to incorporate in my parenting.. I know kids will lie sometimes and be disrespectful especially in teen Years but this is starting to get out of control.