Please help, I've found ferrel kittens.?

Approximentally 2 weeks ago my husband started feeding 2 malnutritioned and tiny kittens that were either abandon or born under an old unused boathouse in an industrial area. We realize living in Canada that the kittens will not survive the winter and predators, there was no mom in site. So we caught them. We transported them to the vet today, dewormed them, gave them flea treatments and checkups, and immunity shots. The vet estimates there age to be approx. 12 weeks even though they appear to be less than 8 due to mal- nutrition. She doubts they can be rehabilitated as they are very wild and aggresive. I am willing to try. They are presently contained to a small area in my bathroom. I am going to try just talking to them for a while and feeding them as my approach. Please respond only if you are knowledgeable on the subject of rehabilitation. Thank you.