Yes Jimmy Snuka is related to the Rock...but Snuka never held a title...
Anyway here is the break down of The Samoans...
The "High Cheif" Peter Maivia is the original...his newphews are Afa and Sika (who are brothers) and Jimmy Snuka (who is a cousin to Afa and Sika)......Gary Albright and Rocky Johnson married Peter Maivia's daughters...then Afa had sons Samu and Tahitian Warrior...Rocky Johnson had his son The Rock...and between Gary Albright [and wife] and Sika [and wife] their children are Tonga Kid, Yokozuna, and Rikishi Phatu (I am sorry I don't know who belongs to who with the last three
)...anyway I hope that clears up some of the ideas about the Rock's family tree.