I was consulting The Google in an effort to learn more about Tinsley's background, specifically where the family money was derived from. In doing so, I came across two very different accounts of her dad, one being his obituary where he is portrayed much like you would expect a moneyed, she she foo foo member of society. The other...not so much.
https://www.legacy.com/obituaries/palmbeachpost/obituary.aspx?n=george-riley-mercer&pid=174515732
http://guestofaguest.com/new-york/tinsley-mortimer/tinsley-mortimers-dad-george-mercer-model-of-a-modern-major-general