I'd say they have a good relationship. From an interview with Bobby (which can be found here
"John is John, not Jerry,” Weir said. “When we auditioned him, we were looking for him to speak his own voice. Bit by bit, he’s stepping into the role of himself.
“It takes time to transition, but we’re not looking in him for somebody to emulate Jerry.”
How did Kadlecik immerse himself so quickly into the Furthur fold?
“John’s an amazing player,” Weir said. “He listens as hard as he plays, and that’s really important in the kind of music that we play. He’s extremely versatile, and he’s got a lot of spark.”
Weir hopes to write some songs with Kadlecik in the near future. But for now, they’re carrying the torch that was lit in the ’60s — one that still burns brightly.
“When we’re playing, I can still hear Jerry, but I’m not hearing it from John,” Weir said. “I’m hearing and feeling Jerry from somewhere else. I may be lapsing into abnormal psychology here, but I don’t think so. If somebody lives in your head and your heart for a few decades, they don’t go away.
“In Jerry’s case, he’s not gone, so we don’t need to replace him.”