Sadly for Miles, she's invested in this conversation. If it's long history and a 'laugh among friends,' surely it can't be that difficult to retell to a family member.

There's a long moment where she studies Miles' expression. Whatever test she's examining him for, he seems to pass because she nods firmly. "He must have if he's standing here today. He hasn't breathed a word of this to me." Among many, many other things she's learning slowly about through others around Ivan.