Hypothetical- If you, a baby, and a child family member were in a life or death situation...?

Okay an axe murderer comes to your house. He has 2 hostages with him and he of course has you as a hostage. No one has a chance at escape. It’s you, a baby that is in no way related to you and you don’t know the baby, and a child family member. If you have a child than that is the child in the situation. The murder tells you that 2 of you must die and it’s up to you to decide. Who lives and who dies? Be serious this is very important to me that you’re all truthful about what you believe you’d do.
There will be an addition later. If you answer this first part please answer the next part.