I agree, I am the oldest and the only one out of 3 that answer the phone every time it rings. (I have 2 grown younger brothers with their own small kids) I kid around that if I am ever really in need I will have to call a friend because none of my family including my grown son and parents will answer the phone. Drives me more than a little batty!! Everyone calls me because I answer or call immediately back. They all even call me to check on each other, again makes me crazy! So no Sam calling Mary to tell her if she needs to talk to Dean to call his phone doesn't seem strange or out of place to me.