CaresMildly, this is a horrible situation for you and you're clearly upset by it. It's not my place to say who I think is right or wrong, and in a way that doesn't really matter (bear with me - I'm not saying your hurt doesn't matter, just that the ins and outs of it are often not the point, if you see what I mean.)
My own experience of things like this is that other people want you to 'move on' because they can't cope with the bad feeling, but also don't have the balls to apologise. You could say to them "I'll move on when I get a sincere apology" but TBH it sounds like you could be waiting for a long time, and if you're stewing about it for a long time while waiting for an apology, that's not going to do you, your DD or your relationshp with DH any good at all.
My advice to you, if you want it, is to find a way of moving on for your own sake, not your BIL's or anyone else's. Forgiveness is something that you do for your own sake, not for anyone else's - and for me the time to forgive / move on is when you're so sick to effing death of carrying around the emotional burden of hating them / feeling hard done by / stewing over their lack of apology that you just think 'fuck it, had enough, you don't deserve this amount of my energy.'
Forgiving him / them and moving on doesn't mean that what they did was right, or that you condone it, or that you were wrong. Not at all. What it does mean is that you can no longer be arsed to waste your energy on them or the situation, and you'd rather put your energy into your DD, your relationship with your DH, and finding work with people who appreciate your skills, have proper written contracts, and abide by them.
If you can get to a point where you can think 'fuck 'em, not worth my energy' and let it go, it's like putting down a HUGE bag of crap that you've been carrying. Makes you feel lighter, and easier, and gives you more energy for the good things in life. Like I say, doesn't mean they were right, just means you can't be arsed to waste your precious time and energy on them / the situation any more.
I hope that helps - it's always helped me when I've managed to get to that point, although sometimes it does take a while to get there.