Every election since my kids have been old enough to vote, we knock each others votes out. My daughter cancels me and my twin sons cancel each other. I guess we could all just stay home, since we basically end up in a stalemate, but we get out there anyway. My mom and dad and my sister and brother-in-law always did the same thing to each other. It's a family tradition.
Even though two of them vote the wrong way :) I am proud that they all care enough to make the effort. I would much rather be canceled out because they want to add their voices to the direction the country will take next, as opposed to them not participating. Besides, I have 4 more years to work on the other two and maybe by then I'll have them all straightened out.