Supergirl, Season 4

Lex:
Did I ever tell you about my dog, Ignatius? Before you joined our family, he was my closest companion. And when I was seven, he had to be put down.

Lena:
If you're gonna continue to compare James to your dying dog, I'm not sure I'm gonna be amenable to your point.

Lex:
I wanted to be there for the procedure. But Mother insisted that I go on a business trip with Father. She thought I was being too sentimental.

Lena:
That's our mom.

Lex:
That's my mom. A trip with Father, that sounds like something that ordinarily would've pleased me. But on this particular trip, he brought a woman with him, and insisted that she go everywhere with us. [coughing] So, here I was, seven years old, dog dying, Father ignoring me.

Lena:
Is there a point to this story?

Lex:
At first, I swore to loathe this woman. How dare she take my father from me at the moment I needed him most? But I couldn't keep my promise. Because she was wonderful. She was so kind to me. On the day they put Ignatius down, she embraced me, and sang me this beautiful Irish song. By the end of the trip, I wished that she was my mother.

Lena:
But she wasn't your mother.

Lex:
She was yours. I want you to know with certainty that while I came from poison, you came from love. And if the rest of this family stands steadily in darkness, you will always fall into the light. I knew that from the moment I met her.