The NCAA rule book is very clear about coaches not being allowed to pay to players or their families (13.2).
— Josh Vitale (@JoshVitale) March 12, 2019
There is a rule stating that outside sources are prohibited from supplementing a coach's salary, though it's not clear who would be at fault in such a case (11.3.2.2). pic.twitter.com/eg9itro9Lq