Nothing calls a river raise that you beat, unless they put you on a total bluff... Raising is bad here. Just call.

At a home game recently I had 78s with a flop of 7A7. I lead into an agg, yet 1st level, friend and he called, and I knew he had the A. Turn was a 7 and I lead again, he called. I checked the river knowing he would bet the A and wouldn't fold it, raised allin and he said he had to call. Bonzai.