The film is not able to be embedded, but can be found here.

Working under direct cinema greats Ed Pincus and Ricky Leacock, a 22 year-old Mark Rance made Mom (1974), a 16mm documentary while working as a teacher at MIT. In this sorely forgotten gem, Rance set out to document his mom, age 47, as she returns to school and attempts to upstart her career in fashion design. He tracks her through their home in Illinois–interacting with his father, Burt–and in school at the Fashion Institute of Technology in New York, working hard to put on a fashion show. What starts as a fairly conventional portrait winds up as something more revealing and heartbreaking, tantamount to the more celebrated works dealing with women and motherhood.

Rance, now running the restoration company Watchmaker Films, writes on his Vimeo page:
This film turned into a double portrait of her and of me. I hope it stands up as a document about women who made choices that involved sacrifice. Regarding the inevitable issues of privacy that the film challenges I can only hope you choose to watch the whole film before making a decision about whether I went too far. I stand by it, but you may not agree. For the record, this was shot on a CP-16 with a Nagra SN gaffer-taped to the side. I have the camera weighing about 30lbs when fully loaded on my right shoulder with nothing more than a 10mm Switar lens and I am holding a fairly nice Neuman mic in my left hand. Pincus called it Southpaw shooting. The film stock is mostly 7242 and pushed generally 3 stops. This transcode is from a low-res proxy off a 2K scan of a very beat-up print.