Until one spouse dies it almost all one ABC unit. Once the first spouse passes away, the trust gets divided in Income for Life to 2 equal parts, "A" Trust and B Trust. "B" Trust becomes irrevocable. "A" Trust is termed the marital trust owned and controlled by the surviving spouse. "B" trust is known as the decedent's trust (passed away spouse). The B trust is split into two trusts, "B" and "C". "C" trust additionally be known as Q-TIP trust (Qualified Terminal Interest Property Trust). Likewise...