Ajo's father must have left some near relatives in this country when he became a recluse in his far-away island.

Why did he become a recluse?
That's a subject I must consider carefully, for he was a man of money, a man of science, a man of affairs.

Jones has told us he has no relatives here.

He may have spoken honestly, if his father kept him in ignorance of the family history.

I'm not going to jump at the conclusion that the man who calls himself Jack Andrews is a near relative of our Ajo--a cousin, perhaps--but I'll not forget that that might explain the likeness between them.
"Ajo's father must have amassed a great fortune, during many years, from his pearl fisheries.