I don't believe that Harper Lee ever addresses a response from any of Dolphus Raymond's "mixed" children concerning their status. We do know that Dolphus "shipped two of his up north. They don't mind 'em up north." Jem claims that his children still living in Maycomb are "real sad," but this is Jem's opinion--not their own. His children in Maycomb are described as looking
... all Negro to me: He was rich chocolate with flaring nostrils and beautiful teeth. Sometimes he would skip happily... (Chapter 16)
Since Dolphus is a fairly wealthy man--"he owns all one side of the riverbank"--his children probably have fewer needs than other Negro children in the town. The children are, however, looked upon with curiosity by the white townspeople of Maycomb.
Scout's closest description of Boo Radley as a heroic character probably comes in the final chapter.
He gave us two soap dolls, a broken watch and chain, a pair of good-luck pennies, and our lives.