I am LIVID!

Sweet face 82

I changed the schedule around for DS's dad so DS could attend a family party for his cousins.  His dad brings him back tonight at the agreed time, but REMOVES HIS JACKET (one he bought for him), hands me the jacket I sent with him, and then hands me DS...at night...out. in. the. cold.  I already e-mailed my lawyer, but I feel so helpless.  He told me that if I had let him have LO overnight, then he wouldn't be out in the cold.  I am documenting, but how do I protect my LO?  I feel helpless.  He tries to get to me by being cruel DS.  But, more time with his dad is in DS's best interest, according to him.