Mr. Nash

Mr. Nash is the father of Reilly and Lucas Nash.

History
Mr. Nash and his wife were called to the hospital when their sons were in an accident trying to outrun a train. They waited until Lexie came out of Lucas's surgery to update them. They revealed that they hadn't heard anything about Reilly, so she also had to break the news to them that he had died in the ER.

They were later told that Lucas would be okay, though Jackson Avery said to warn them that Lucas would be wracked with guilt because he lived and Reilly didn't. He wouldn't be able to talk about it, but he'd want his parents to know.

Romantic
He is married to Mrs. Nash.

Familial
His son, Reilly, died in a car accident that also seriously injured his other son, Lucas.