Ricky's sister might be able to hire a lawyer to represent her brother, but she cannot make the decision for him to invoke his right to an attorney or to be silent, the detectives did not have to stop questioning Ricky just because the attorney said his sister hired her to represent him, they would have had to ask him if he wants to invoke his rights and have her represent him. The only situations that allow one person to invoke another's rights are if it is a parent and/or legal guardian doing so on behalf of a child that is a minor, or a parent/legal guardian of an adult who is mentally disabled.
There is no "Sicilian Gambit" in chess. There is the Sicilian Defense (1. e4, c5) which is one of the most popular openings in the game.