what is the statue of limitations on filing a claim against inlaws that stole from my home and won't let me view a will

My inlaws stole from my home when I was not there and went to another state. Now they won't give the stuff back. They stole from me after my husband passed away and they did not tell me until two weeks later for me to bury his remains. They also won't let me see the will in which his father left him assets while we were still married.