There is a lot of excellent advice here, let me add to it. If you do not keep a journal, start doing so. As much as the memories hurt, I would recommend doccumenting in detail each of these encounters and especially dates and times. IF you have to go to court with this it will help with the accuracy of your testamony and establish that there has been a consistant pattern of unwanted contact.

It is likely if your uncle is doing things like this to you that he is also making unwarranted advances on others as well. He has a major sickness, YOU ARE NOT THE PROBLEM.

Best of luck to you in this.

TJ