List of courtesy titles in the peerages of Britain and Ireland

Columns: Peer | Son | Grandson
The Marquess of Headfort | Earl of Bective* | Lord Kenlis | The Marquess of Sligo | Earl of Altamont* | Viscount Westport | The Marquess of Ely | Viscount Loftus | The Marquess of Exeter | Lord Burghley* | The Marquess of Northampton | Earl Compton* | Lord Wilmington | The Marquess Camden | Earl of Brecknock* | Viscount Bayham

Example questions:
Who was the Courtesy title of the father of the Earl of Aboyne originally created for ? | Who is the current holder of the Courtesy title that belongs to the grandfather of the man whose title was created in 1728 ? | When was the Courtesy title of the grandfather of Lord St John created ? | Which country 's peerage is the Courtesy title of the son of the Marquess of Bute a part of ?

Answers:
George Gordon | Spencer Compton | 1551 | Scotland