I don’t think they’re married are they?
Maybe his plan was to leave her but he wanted to take both kids (the boy is his anyway) with him so he “stashed” the baby girl with a relative and was planning on escaping with the boy a few days later. He’d pick up the baby from the relative and the 3 of them would have been on their way to freedom.
That’s my conspiracy theory and I’m stickin’ to it. :)
Sounds good to me. ;)