Noblesse oblige.

He felt that it was so.

Then there crossed his brain visions of a future life which were injurious to the girl he loved.
Let his brother Jack come and live at Scroope and marry Sophie Mellerby.
As long as he lived Jack could not be the Earl, but in regard to money he would willingly make such arrangements as would enable his brother to maintain the dignity and state of the house.

They would divide the income.

And then he would so arrange his matters with Kate O'Hara that his brother's son should be heir to the Earldom.