Please answer the following question: Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: How is Valerie related to Marcos? Title: Nine Queens Movie plot: The film opens at a convenience store early in the morning. Juan, a con artist, successfully scams the cashier, but later makes the mistake of attempting the same scam again on the next shift. Marcos, who has been observing the whole time, steps in pretending to be a police officer and takes Juan away. As soon as they are far enough from the shop, Marcos tells Juan he is not actually a cop but a fellow con man. Juan asks Marcos to show him the ropes, because his father, also a con man, is in jail and he needs to raise money quickly to bribe a judge to reduce his father's sentence from 10 years to 6 months. Then a rare scheme seemingly falls into their laps: Sandler, a former business associate of Marcos, needs his help to sell counterfeit copies he made of some rare stamps called "The Nine Queens". The potential mark is Gandolfo, a rich Spaniard who is facing deportation and desperate to smuggle his wealth out of the country. He has no time to fully check if the stamps are authentic but he hires an expert to do a quick check and is satisfied. He offers $450,000 for the stamps, the exchange to take place that evening. In the intervening time, a number of things go wrong. The stamp expert demands a cut, as he knew the stamps were in fact forged. The fake stamps are then stolen out of Juan and Marcos' hands by crooks on motorcycles who, unaware of their value, destroy them by tossing them into a river. To salvage the scheme, Marcos approaches Sandler's widowed sister, the owner of the real stamps, who agrees to sell them for $250,000. Marcos can put up $200,000 and asks Juan to contribute the remaining $50,000. Juan suspects that he is being scammed, as it's a remarkable coincidence that Marcos needs just the amount that Juan has saved up; but as the $50,000 is not enough to help his father, he reluctantly agrees. They buy the real stamps and go to Gandolfo's hotel, but he says he has changed his mind and will now only buy the stamps if he also gets to sleep with Marcos' sister Valeria, a hotel employee....
A:
His sister