When you are talking to a young person and mention another person who is older (and vice versa, speaking to an older person and mention a younger person), but refer to the people as you, which verb choice should you use, vosotros or ustedes?
Examples:
John (older person) and you (child) are going to the store tomorrow. How to translate You (both) are going to the store tomorrow (speaking to a child when the older person is not present)?
You (older person) and Maria (child) are going to the store tomorrow. How to translate You (both) are going to the store tomorrow (speaking to the older person when the child is not present)?
Also, does it matter which form is used (vosotros or ustedes) whether or not both people are present (both older person and child)?