JRT and miniture schnauzers

Hi there,

I'm about to get a male JRT puppy and I would like very much for our new pet to be socialized with my parent's pets (2 female miniature schnauzers 12 - 15 lbs each) since they will most likely be spending a lot of time together. I plan on having them all spend time together immediately - but should I be very concerned about them being alone together in the future? I figure they will all be approximately the same size in terms of height and weight.