A clue, perhaps, from Frank Hird's "Lancashire Tales" (1910):

"The salient points in the first Robert Peel's character were repeated in his son, the first baronet, and in his grandson the Prime Minister......he was a reflecting man, who looked ahead, a plain-spoken, simple minded man, not literary, and possessing no refinement in his tastes, free from affectation, and without any desire to imitate the manners or modes of life of a class above his own. His sons resembled him, and a strong likeness pervaded the whole family."