Will these puppies get along?

i am about to get a girl miniature labradoodle called lexy =D (please no comments dissing muts)my sister has a cairn terrier x jack russel who is very friendly and excitable (shes called maddie) and has already got a fried a black labrador. will they get along? also my friend has a miniature Schnauzerr,all of these dogs are puppies maddie is 14 weeks lexy will be 7 weeks and my friends Schnauzerr is 9 weeks