K.B.
Well with my children, if they bit me I bit them back(not to hard, but yet hard enough) that would help break them. Also with the older siblings I let them do the same back as well. I tried the yelling, time out, and so on. But it didn't stick, I had to show them exactly what they were doing was hurting. Eventually they understood. Now I don't have a problem, other than the usually sibling rivalry such as she's looking at me, or copying me.
You may not like it, but tough love seems to work the best. Good luck.