My parents complain about each other to me, and I don't know what to do.

if i were you then i would sit them both down and make them work things out

My parents are divorced, and they complain to me about how the other is devious, disgusting, and a cheat all the time. As a kid, I think the most important thing is to show parents that you support them; but not their behavior. Sit down and have a talk with them.

Let them know your aware of the situation and how it makes you feel and maybe you guys can have a talk together and get everything out in the open

Kindly and respectfully tell them both that it makes you uncomfortable and you would prefer it if they would stop doing it. They may not realize that they are doing it.

Well, parents sometimes use each other as tools to hurt each other so sometimes just speaking up in a calm, respectful manner still remaining firm you can tell them that you don't want to listen about bad things about your mom or dad.

I have experienced this, and I always find that the best thing to do is to be indifferent and not take sides, as that only includes you further.

Mature parents should not do this. However, if this is the case -try not to be judgemental towards them, and just let the complaints pass through your other ear. Don't let those critical words about each other influence on how you feel about them. Try to focus on how good they are as your mom and dad - although they complain about each other, they still are fulfilling their role in raising you as your parents-

Explain to them that, as their child, it is not your responsibility to be on the receiving end of their negative thoughts about another member of your family. It's not healthy for them to be using you as their outlet for frustrations they are feeling towards each other. Whilst it is important for you be emotionally available for members of your family, and offer support where and when it is needed, it is also important to respect the boundaries and dynamics of certain relationships; a parent should not expect their child to be the recipient of their emotional baggage when that child has a personal connection with the other parent who is being talked about.

I heard mine do that once in a while as well. I never told them, but I wish I told them that it really bothered me because I really didn't want to be annoying..

I would tell them that whatever issues they have are between them and you don't wish to be included. I would also reassure them that I love them both and for them to complain to me is very hurtful.