I've observed a curious difference between US and British English.
US English:
A: "What are you doing this weekend?"
B: "I'm visiting with my grandmother."
A: "On your own?"
B: "No, I'm visiting with my grandmother with my sister."
British English:
A: "What are you doing this weekend?"
B: "I'm visiting my grandmother."
A: "On your own?"
B: "No, I'm visiting my grandmother with my sister."
AJ