Separating Bassett from his “brother”

Many many time dog owner and foster home, first time potential Basset owner. My wife and I were informed of a senior Basset (8 or 9 years old) urgently needing a home. His pitty brother (raised together since puppyhood, one owner) also needs a home. The phrase “bonded pair” has not been used, but they’ve grown up together and the owner would like to place them together. We already have a young dog that would definitely be the shadow of any new dog we bring home and we think would thrive with an older “sibling” to help him gain some confidence but three dogs sounds like too much – especially since we like to spare no expense on our dog-children and our home is fairly small. So the question: how attached are Bassets to their canine siblings? I can imagine splitting these two up would be hard regardless but I’m curious if bassets tend to be more attached/how adaptable are they (maybe not due to a stubborn nature?). I have a feeling our hearts are going to end up bringing them both home, but want to explore the option of only bringing one home if it doesn’t seem like he’ll deteriorate with the change.