“Caine simply married a distant sister.”

“If All Men Were Brothers, Would You Let One Marry Your Sister?”

“one of the sisters started shaving her legs and marrying tax inspectors, so she was no good.”

“We get an apartment together, and after a whirlwind courtship you marry my sister and honeymoon in Vegas.”

“She [Mary I] married Philip King of Spain, who in her sister's reign, was famous for building Armadas.”

“Sisters function as safety nets in a chaotic world simply by being there for each other.”

“You go to Sodom and Gomorrah, but what do you care? Ain't nobody there would want to marry your sister.”

“There is no Levitical decree between nations, and on this occasion I can see neither sin nor shame in marrying our own sister.”

“We are more inclined to marry [your] sister the infanta, Isabella, than anyone else because there is no daughter of a king as ready as her.”

“If you married me, it would be scandalous and innapropriate, and doors would be closed to you."
"Good God, woman, I let two of my sisters marry Gypsies. Those doors have already been closed, bolted, and nailed shut.”