Answer from the Mayhew Family is a written note found in Dishonored 2.
We're ashamed to say that we won't wait for your return though. One morning, all the bread in Gideon's bakery was turned to ashes; on another, the wool yarns in my haberdasher shop were full of snails and slugs. There's a curse on the city, and I'm not even talking about the Hatter gang who now rule over our streets.
Anyway, we're returning to our old home in Potterstead, where Alexi grew up. Good luck to you.