Dinner conversation

Greta: "I'm going to marry Lincoln because I love him."
Carey: "You can't marry Lincoln; he's your brother."
Greta: "But I want to marry him because I love him."
Carey: "I know you love him, but you can't marry him because he's your brother. Sisters don't marry brothers. You love the person you marry, but it's a different kind of love."
Lincoln: "I love Greta. I'll marry Greta."
Carey: "You can't marry Greta. She's your sister. It's against the law. So think of someone else you love that you can marry."
Greta: "I love Duncan."
Carey: "You can marry Duncan. Greta McVety; that sounds nice."
Greta (giggling): "Greta McVeeeeety."
Lincoln: "I love Duncan. I'll marry Duncan. Lincoln McVeety."
Greta: "You can't marry Duncan. He's a boy. Right, mommy?"
Carey (deep breath): "Lincoln can marry anyone he loves, except you, because you're his sister."