Of whom or of who?

And I think it is this decision of what takes precedence, and when and why it does, that often throws us off. Thanks again for going down this rabbit hole with me and hopefully contributing to more detailed information online about this pesky issue.

I have also just found one more very reliable source https://www.grammarphobia.com/blog/2012/08/whom-truths.html which unilaterally supports the use of "of whom" in all expressions involving these sorts of quantifiers (many, few, all, both, two, etc.), adding that the prepositional phrase, of whom, functions as a partitive.

All the best!