RD,
Sorry that you are going through the family crap, had a little trouble following it though. It seems like the JW's all over have dysfunction in their families.
Your truck does sound like a head gasket problem, or a cracked head (hope not). Check to see if you have coolant in your oil. If so repair it without delay, as it will ruin the whole engine. Since you just bought it see if they will fix it under warranty. (many used dealers have them)
Good luck
JK