Elton John's parents are jointly responsible for the "pop-up house". These paper homes, while certifiably stable (see photo above) were never mass-produced owing to the prohibitively large number of children needed to get one open.
David Crosby's father Werner invented "gree-ellow" - a colour David refused to ever sport.
Jefferson Airplane's Grace Slick's mother invented the "baby".
Donovan shows off just three of the identity-changing cosmetic treatments pioneered by his dog "Doctor McAllistair".
Richie Havens models the nuclear coolant synthesised by his conjoined siblings Sweets and Gummo.
Uncle Gretchen poses with the patented Succubus-Absorbent Silverware he used to exorcise a grateful Eric Clapton.
And of course Frank Zappa's sofa invented holograms.
(Thank you, arrowheadvintage.com)