I guess I should explain the relationship first. My dad dated a woman for years. The result was my older sister and brother. A few years later our dad married my mom. My sister and I were the result. Through all of that my brother and sister's mom was very nice to us. All of us, my mom included. Around Christmas we found out her cancer had spread throughout her body. Last night my brother & sister's mom died and I have no idea what to say.