Part of the larger microformats Advocacy and social-network-portability efforts. Adding XFN - The XHTML Friends Network to these sites would improve their usability and ambient findability. Keep in mind hCard advocacy for these sites as well.
See hCard+XFN supporting friends lists for some good examples in the wild of sites that support XFN.
These sites have identity links, but no rel="me"
Pending a full-blown genealogy microformat, sites can be encouraged to use the existing XFN - The XHTML Friends Network
rel values for family members: "parent", "child", "sibling", "spouse" (with, of course, hCard). So could genealogy tools which generate family-tree web pages.