21. August 11, 1969
Mother redoubles her efforts to educate him about the House of Black. One of her tangents is about carrying on the line, but Sirius knows that he never wants to have children anyway, so he's mostly tuning it out.
"It is your duty to have strong children, especially male ones, who can carry on the name…"
Something strikes him about the word duty. Loyalty to his family must mean doing things that he hates to prove himself (tojours pur, puritate in aeternum). It's the only way to prove he cares. Reg is nodding along, and Sirius finds himself nodding, too.
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