I’ll agree with Brian that the important stuff is your kung fu and that we as the Hung Gar community should support and promote each other not take little stabs to prop up one line over the others.
Again, this is pretty simple but everyone is making much more out of it. I’ll tell you what I think happened based on different accounts and let you know where I get my information. I am a student of Wing Lam so my lineage comes from both Chiu Wai and Lum Jo. I have visited both my Si-gungs several times and spoken and trained with them.
Chiu Wai - When Lum Jo took over Lam Sai Wing’s school, he took out ad and called all the current students of LSW, his own. [my note: This is not as disrespectful as it sounds since he was now the “head of household.” and it’s common in Chinese heirarchy] Of course his Si-Hing’s didn’t agree since LSW never did the official passing of the line ceromony. [my note: Lum Jo did this while they were all alive and kicking so it’s not a case of waiting till they couldn’t defend themselves]
At least Chiu Kao confronted Lum Jo about this and they disagreed at first but eventually Lum Jo agreed that he was rash. Chiu Wai and Lum Jo are currently on good terms.
Lum Jo - I’ve never asked Lum Jo if he considers Chiu Kao his student but I have some observations while there. They have a book published on the anniversary of LSW’s birthday with a list of LSW’s students and Chiu Kao is listed as one of them. I think this was published in 1972 but I’m not sure.
I’ve never seen a lineage chart on the wall of Lum Jo’s school. Though you will see my picture on the wall and in the albums 
When I was at Lum Jo’s school last week, I showed Lam Chun Shing (Lum Jo’s youngest son) a printout of his section on the Lam Chun Fai site and he or Si-Gung had never seen it before. So it’s safe to say that though the site is officially affiliated with Lam Chun Fai, it doesn’t mean that they have proof read it or sanctioned everthing on it. Remember, it’s created out of Southern California. I also know that Lam Chun Shing does not speak or read english but I’m not sure about LCF.
So why do I take time to explain this in detail? To show that there is no sinister plot to bring one line down or prop one line up.
BUT even if there was, who cares!
If Chiu Kao says he learned from LSW and you are his lineage, either believe him or change your affiliation.
If Lum Jo wants to say the Chiu Line is under his, then it’s a matter for the Chiu’s to handle and we should believe what our Sifu tells us.
WE as an internet community need to share our lines perspective but should also be respectful of others perspectives. Both Chiu and Lum lines have great Hung Gar. There’s a lot to be learned from both. We sometimes lose what’s really important.