What did Nanna meanby , when speaking about John to Jane, "I tended to him and his sister for several years"? Who is his sister? Was she reffering to Jade, John's ectobiological sister? Because I don't think Nanna interacted with her. Does this mean John had a sister we didn't know about? on page 9705

Jade is John’s sister genetically. Nanna was with the both of them through the three years so of course she interacted with Jade.