Good luck.... Don't want to be part of the broken record, but definitely get them out of their asap.... If he will kick her when a boarder is their, no telling what he'll do if when he's alone... I have recently dealt with an A-whole barn owner, so I definitely feel for you, and I also know what it feels like to be trapped at a barn (no matter what reason) so hope you find the perfect place after all this crap...
Just want to warn you you may have a lot of drama come moving day!!
When we move our horse, our guy said we didn't pay him for the month about 5 mos before which was hoopty crap because he calls us two days before its even due to get it!! Not to mention we left some money with his grand daughter (also my cousin although he is on her other side) and she said we didn't!!
Now she has a history of stealing stuff from others too (in hind sight, maybe we shouldn't have left it with her

) but it costs us twice that month.... And we had to pay him an extra month's board for the one we 'missed' I can't even imagine what he would do if he waited a whole freaking month for it.... We were out of town when all this drama went down so when he got mad and told us he would turn her out of the pasture if we didn't get there and take her right now thought I was going to have a heart attack.... well my aunt saved the day and got her...
But anyway, sorry I wanted to vent!!!
Good luck!!! You may be in for some of that drama especially if he thinks he has any rights to the foal....