To Don Rodrigo, the answer to that question is a matter of honor, because he knows that the alluring Lucrecia, now at 32 the widow of his son, whom she married at 18, was unfaithful to him during their marriage.
The answer to that question is a matter of honor. This is to Don Rodrigo. The alluring Lucrecia the widow of his son, was unfaithful to him during their marriage. This was now at 32. This is what he knows. She married the widow at 18.