Do they get an allowance? If so, they need to pay for the missing/broken items out of their allowances. If not, then they need privileges or "toys" taken away for a period of time, or chores. If there are no consequences to the behavior, it will never stop.
BF needs to cooperate with this, though. I wonder if he's hiding stuff from you because he's involved in the roughhousing? Some men (and women, to be fair) never grow up and don't understand that they need to be parents/role models instead of friends with their kids.
I hate to say it, but if dad isn't interested in stopping the breakage, you need to think about whether or not you can live with it. And what about your dogs? If they're being rough enough to break a chair, could one of your dogs be an accidental casualty? A crockpot can be replaced. A precious pet cannot. |