The fact that you are making a record of his abuses is the main thing. Even if it seems that nothing is coming of it, there is still an official record out there.
Hang in there. I know it's tough and I understand you thinking about just packing up the girls and leaving, but it's very important that you not do anything that will make you look like the vindictive one, or the crazy one, or the one lying and causing all the trouble. Things WILL get better, but it may be a while yet. Just hang in there and keep doing the right thing by you and the girls.
