Can money, securities, etc. that are received by one spouse through an inheritance be subject to division in a divorce?

My mother passed away in early July 2013 with my father passing away in December 2007. Their trust identified me and my three sons to receive specific percentages and became irrevocable upon my mother's death. The money, securities, etc. were received from a trust my parents had and have been placed into an account that only I have acces to which does not have my wife's name, etc. associated with it. It is my private account and she was NOT designated as ToD for the account, I designated one of my sons as the ToD for the account. I maintain a strong "firewall" with that account insuring that none of the funds, securities, etc. pass into our joint account. I am seeking to know if that account could be included in the "marital property".