It Gets Even More Confusing

The two women were each called Ms. Stewart, which didn’t make sense. But this was only the beginning of a mind-boggling journey.
“Ms. Sarah,” the man tried to change the name to avoid confusion.
But as before, both Sarah and the woman answered the title. “Are both of you called Sarah Stewart?” he asked with a disbelieving chuckle, wiping his mouth with the back of his hand.