My stepdad past away last night so suddenly and I’m super worried about my mom and younger sister.

How can I be supportive? I live 3 hours away and I plan to go visit tomorrow. But I just don’t even know what to say. My mom feels guilty for not making him go to the doctor for his issues but I told her it’s not her fault. He had a bad seizure and went into cardiac arrest. They were able to revive him but he was brain dead from not breathing so they pulled the plug, plus he had no insurance. So im sure they played a part in that decision. It’s just so sad. He was only 50.