I suggest rehoming her, and never getting another dog. Boxers are extremly hyper, they need a LOT of exersize and a LOT of training, I dont know how you can justify saying your dog is to hyper so you stuck her in a smaller kennel, and she is still to darn hyper..??? that just makes absolutly zero sence to me, obviously she is going to be getting out she's bored, she needs mental and physical stimulation. I dont suggest selling her to you brother in law as it sounds liike he intends to breed her. I suggest sending her to a boxer rescue. it seems to me the onl reason you really want a dog is to know you have one there so I siggest you head to the nearest toy store, buy one of those life sized dog stuffies, stick it in the kennel, wala you will have the assurence that you have a dog, it wont need attention, training or human interaction, and it wont jump on your kids.