From Don Juan:
This heathenish cross restored the breed again,
Ruin'd its blood, but much improved its flesh;
For from a root the ugliest in Old Spain
Sprung up a branch as beautiful as fresh;
The sons no more were short, the daughters plain:
But there's a rumour which I fain would hush,
'T is said that Donna Julia's grandmamma
Produced her Don more heirs at love than law.
Does this imply that she had extramarital relations, and these heirs had other fathers?