Why Can We Euthanize Pets but Not People?

Questions about why we can euthanize pets to end their suffering but we can’t do the same for people, how to talk to a six-year-old about biblical marriage when she’s been told same-sex marriage is okay, and thoughts on the phrase “biological sex.”

• What is the biblical position on euthanizing pets that are old or sick, and if it’s okay, why doesn’t the same principle  apply to people? They shouldn’t have to suffer either.
• How should I talk to my six-year-old granddaughter about biblical marriage when her parents tell her same-sex marriage is okay and she brings it up often because she’s confused?
• What do you think of the phrase “biological sex”? What other kind of sex is there?