I searched that PDF for family/families and found nothing, but I did find that you are actually even more correct. Most of that report is about accredited investors. Less than 5% of non-accredited investors own private securities. So, it's actually quite rare.
That said, to answer your question, you could own Flock stock. Private companies often offer stock to employees and others.
That said, to answer your question, you could own Flock stock. Private companies often offer stock to employees and others.