To answer a few questions:
MZB admitted freely that her Darkover books are not consistant in their information and time lines. However, she did put together a timeline for those who want to read the books "in order". See www.mzbfm.com for details.
Mercedes Lackey is not related to MZB, but they are good friends. Another writer, Diana Paxson, was "discovered" by her and is her sister in law.
I can't tell you all how much it has pleased me to see your posts here about MZB. It is wonderful to see how many people loved her and her work as much as I do.