Ack, that sucks. I would stay away from MIL and SIL's walls. You can block their status updates so they don't show up in your feed. Or you just unfriend them and keep up with them via email. You know I'd never jump in to defend H but I honestly don't think he thinks about you seeing his posts.
BTW, if you want to find me on FB, let me know.
If you love somebody, set them free. http://tinyurl.com/2empx2g