My 25 month old will not sleep through the night and I think my wife is to blame?

He does not need any feeding in the middle of the night, he's 2. It's just a bad habit at this point and possibly a sugar fix that he must have since you all mix that crap his milk. I'm sorry to be rude about the Nestle mix, but it's crap and it ruins the nutritional value of the milk. If it were me, I would go cold turkey, no "feedings" in the middle of the night, no bringing him into your bed, and no going back. You have to be firm and let him cry it out. It's not going to hurt him, but allowing him to continue like this could. It could cause serious sleep issues as he gets older, even adult insomnia. It may take a few nights but once he knows you are serious and no one is coming in to get him, he'll learn and start to get those self soothing techniques that he can use to get himself back to sleep unisted.