Oh Valerie.... I'm crying with you. My heart is broken. There are no words to comfort you in this situation. (((BIG-BIG HUG))) why did this had to happen again?!
I had one thought bugging me as I was thinking a lot about you and your birds. Tiki died of anemia, Cleo had something internally wrong... came from the same parents, same genes. Do you know about other kakariki owners who got their birds from this breeder and same parents? Maybe the other babies are sick and have died too? Could there be some genetic defects (maybe inbreeding?) coming from that breeding pair? Maybe you should talk to that breeder and inform him/her about your losses. If Cleo had splayed legs and other deformities the breeder should not have sold her to you, or if he did he must have had informed you.
It's just a guess as we always look for reasons... Two birds coming from the same parents dying within one year from inborn defects - that should raise a question. I could be completely wrong - it's just a thought...