Can German Sheperd dog good with mongrel dog, life long in one house, when introduced in earlier pupy stage?

Can German Sheperd dog good with mongrel dog, life long in one same house, when introduced in earlier puppy stage? at present iam having both mongrel dog puppy are male and brothers of 11 months old,when i introduce german sheperd dog puppy in first day means 2 months old gsd puppy,can gsd dog when growing up or adult can it make good with both mongrel dog and golden retriver dog because i also plan to buy a golden retriver puppy at same time when i buy a gsd puppy, and where i find original pure german sheperd puppy in chennai? iam living in chennai.along this i want to know that which breed of dog is good for these mongrel and golden retriver and at the same time as a guard dog ?iam living in my own indepenent house with own compoud wall?can 5 dogs are ok in same one house?