Yes and Kaien is who Ukitake is referring to when he is talking to Byakuya on the bridge to the Sekki seki when he first sees ichigo appear. I haven't seen episodes 169-266 so I don't know if it's touched upon but my personal opinion is that they are related. We know Shiba was once a royal clan, and also that ichigo's pops has something to do with the Soul Society (he knows Uruhara and he also has what looks like a captains cape draped over his shoulder in the episode whe Kon is in Ichigos body and he kills the hollow that is about to attack him. So I think that Uruhara made Ichigo's dad (who was Shiba clan) the gigai that allowed him to cross over and marry misaki (Ichigo's mom.) This in turn got Uruhara kicked out of the soul society.   See 6 other replies