This is the baronet.

Who are the others ?" "My father and uncle." "What! Do you mean to tell me there is another branch of the family ?" "Well, yes, in a sense.

My uncle is dead.

His son, my age or a little older, for the youngest of the three brothers was married first, was last heard of in Argentina." Brett threw the photograph down with clatter.
"Good Heavens!" he vociferated, "when shall I begin to comprehend this business in its entirety?
How many more uncles, and aunts, and cousins have you ?" Amazed by this outburst, Hume endeavoured to put matters right.
"I never thought--" he commenced.
"You come to me to do the thinking, Hume.

For goodness' sake switch your memory for five minutes from Miss Layton, and tell me all you know of your family history.