Quique,

While I suspect you are correct that Luke's dad is thinking of another detective show, I believe the blind man and his brother in "A Deadly State of Mind" were twins.

Hi, quid_quo_pro.

I dont't think so: they are brothers, but not identical. In fact, the characters are just brothers, not the actors, without any kind of real relationship.

Salutes.

there was a set of identical triplets, the murderers from Murder by the Book, Publish or Perish and Now you see him. They were separated at birth. ;-)