Exactly. Bruce has mentored 3 boys, but when one leaves they stay connected even Bruce pushes them away. Plus they created relationships with each other (even if they're pretty screwed up in Jason's case). Babs' mentoring is only important as long as somebody's interested in it. Afterwards they can just cut them loose and forget them. And to be fair, the boys are kind of all about searching for a family to replace the one they lost so it's in character for them to be about that, but still I get the sense they respect them as a wish-fulfillment fantasy family. Babs is just babysitting.