How do you deal with it when you believe your dad...

I've posted about my dad on here a few weeks ago, how he steals and is a not so great person and nobody wants to be around him or anything cause of the way he is...Well me and my mom were looking through some of my old jewelry from high school.  Not really worth much of anything.  Well I got out my box with my grandma's class ring and a necklace her brother brought back from world war II for her.  The ring was gone and so was the necklace.  I have waited since I was a little girl for my grandmas class ring.  She graduated in the 1930s and ever since I was little I would go look at it in her little box and say grandma can I please have this.  She would say one day honey.  Well right before she died she told me that her ring was in the little box on her dresser and she said its yours when I go.  It meant a lot to me.  So did the necklace her brother had given her from world war II.  Well they both are gone.   I have a hunch my dad stole them while I was gone.  I always would leave the door unlocked because I have a big ole pit bull who is my baby but he won't let anyone in the house when we're not home EXCEPT a few select people.  One being my dad.  The other my mother (who is no longer married to my dad).  ABout the only other people are the friends of mine I got him from as a pup.  He remembers them anytime they come and he loves them to death.  Those friends would not have taken it.  They are true to the core people.  My mom would die before she would take something like that.  Their is one person who I have a hunch took it.  When I told my husband he said well you know who had to have taken it.  When I told my mom she said do you think your daddy took it.  She said I wouldn't put it past him.  I am devastated as I loved that ring and necklace but especially the ring.  It was sentimental to me.  I had some other rings missing too but I wasn't worried about those, but this ring can't be replaced. 

I just had to vent.  I am so upset over that ring.  I am trying to cut my dad out of my life but he will bug you to death.  My husband has also caught him by the way about to go in our house when we he thought we were gone (the car and truck was gone).  I was gone but my husband was there.  His brother had used his truck.  He was out in the backyard and happened to see him about to go inside and he said when he saw my husband he acted funny and turned around and said he was coming in to see me.  It was very noticable my car wasn't home.  He knew I was gone.  

Needless to say I will be locking my door from now on with a dog or not.  I live out in the country and especially with the dog I just knew nobody would dare come in.  He will snarl at the window by the door.  Nobody wasn't coming in there except select few that he knew very well. 

Just had to vent about this as I am so upset about the ring.