We got colostrum from the mom and started feeding him every hour since he was too weak to stand up to his mom. At the suggestion of our go-to vet Dr. Chris Crombie, we started adding in honey. I ended up sleeping in the van overnight and got up each hour to feed him with a syringe. After midnight I thought for sure he wouldn't make it, but somehow he made it through the night.
On the upside, the chicks are 13 days old and are flying!