Do you think the Sailors Wife is Tysha? She does trick the men she beds into wedding her. Lanna is Tysha and tyrion's child more than likely except no one can expose this except one person, Penny.
Littlefinger said to Sansa, "Tell me. . . did your little lord husband enjoy my jousting dwarves?"
"Yours?", said Sansa.
"I had to send to Braavos for them and hide them away in a brothel until the wedding."
Now we know Penny came from Bravos before she went to Kings Landing and Joffereys wedding. Tyrion's hasn't mentioned Tysha to Penny yet but maybe she would be a device to expose Tysha's whereabouts and answer "where do whores go?"... a whore house of course