What do you call your family members around your other family members?

Growing up, whenever I was talking to my sisters about my dad or my mom, I would say: “Hey, have you talked to Dad today?” Some good friends of mine I went to college with are brothers. When they talk about their mom or dad (or even sister) they say “Hey, have you talked to our Dad today?” Or, “Did you hear what our Mom said?” I had never heard someone refer to their family in quite that manner. Just curious.