Can my mom legally sell my dads inheritance and items acquired before marriage?

Im 16, my mom and my Dad became separated 3 years ago. My Dad pays $350 a week for child support and still my mom thinks she isn't getting enough. My mom has been selling many things that belonged to my dad before the marriage. After he moved out she took a thick chain and chained up one of his 200 year old cupboards that contained one of only four complete sets of a certain type of China in the world. She also sold a baptismal certificate from the 1800's that is in his family name. She is now threatening to sell many of his most prizes inheritance such as his china, his $70,000 silverware set he inherited, over 40 different guns that he acquired before marriage, and worst of all, one of his family members was in the American civil war and she is threatening to sell his muskets, civil war swords, ammunition pouches, and a framed poster signed by Abraham Lincoln stating that my father's ancestor in the civil war was a survivor and a war hero. She already sold $40,000 of tered china sets that belonged to my Dad's mother. My Mom is insane and she brought home her boyfriend from Canada who thinks he knows allot about guns and removed from its box rapping and fire a 20 year old M14 never before used and in its manufacturers box degrading the weapon's price by over $300. My Dad can't take this and I want out. Can my mom legally to this to my Dad's inheritance and items acquired before marriage? Please help me and tell my what I can do to get her to stop. She is controlling and won't listen. Also please if you can include where you got the source for your answer. Thankyou!!!!!!!