The magic of manipulation is no magic, it is a bunch of techniques. You described some of them.
But you have an advantage: You can go from playing straight to using some dirty tricks, while they sure won't start to act fair so soon. Use that advantage.
Basically, what they do is talk and act differently with the different persons or minigroups in your family, however they see they can push the right buttons to get the effect they want. This works, because the different people either do not communicate so good, or they do not believe each other, when told about this.
Here is an angle: Is this happening in one house or, say, two? LIke your place and parents main house? Here's what you can do, and yes, it is a dirty trick, but it can help you.
INstall some surveillance tech, audio/video. Must look innocent, or better not be noticed. For an example, there are shops that sell this tech in random-looking household items.
Record their bullshitting and replay it to the people they abuse.
Or just tape them with some sort of dictaphone which you can öleave somewhere like under a table etc and use that later