Character Promote : Courtesy
A courtesy title is a form of address in systems of nobility used by children, former wives and other close relatives of a peer. These styles are used 'by courtesy' in the sense that the users do not themselves hold substantive titles. There are several different kinds of courtesy titles in the British peerage.
Courtesy prefix of "Lord"
Another form of courtesy title is the honorific prefix of "Lord" before the name. The courtesy title is added before the person's name, as in the example of Lord Randolph Churchill. 
Courtesy prefix of "Lady"
The honorific prefix of "The Lady" is granted to the daughters of Dukes, Marquesses and Earls. The courtesy title is added before the person's name, as in the example The Lady Diana Spencer. 
Courtesy prefix of "Sir"
The honorific prefix of "Sir" is granted to the people in position of respect .The courtesy title is added before the person's name in writing, as in the example, “Sir, Bush” or after name in normal speaking, such as “Bush, Sir.