The sister being an attorney may be why there is nothing on the mother. She might have told mother to keep her mouth shut and stay out of the media. It is a smart thing to do .
If this is the aunt’s Linkedin it may be why family social media was scrubbed so quickly.
https://www.linkedin.com/pub/maribeth-harper/1/42/9a6
Computer & Network Security
http://members.calbar.ca.gov/fal/Member/Detail/99757