There is no official Lilly tree posted online.
There are thousands of smaller trees posted on;
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi
and
familysearch.com
And similar sites.
Is there anyone in the generations before yours that you could go to for more information? I have one Bryce Cox but he was married to Madelina Luca, not Madeline Virginia Lilly. They may be the same people as you are looking for but I like to know some birthdates and locations for confirmation.
Please repost with more information and I will see what I can do for you.
