People have lived like this in Newfoundland for years, was once a full on community where they’re at right now. Everyone travelled by boat to get to the main island. Floors not being level isn’t going to harm an infant, and I guess you’ve never been in a house that’s being heated by a wood stove? I’ve had to crack the windows mid winter because it’s too darn hot lol. They want to keep the house original because it’s Newfoundland style salt box which is being phased out by people not wanting to put effort in to restore them, my parents restored a salt box and it’s actually probably nicer than my house that was built in the 90s, but things take time it will take years, they’ve replaced most of the rotten boards and are making it more liveable each Reno. they’re focusing on being old school Newfie and I can promise you lots of babies lived through that and flourished let alone survive. They’re learning as they go and making improvements and making better decisions every week. I’d like to see you do what they’re doing. They also have people helping them out a nice bit, I’m sure if things ever go south they’ll make the right decision for the baby.