That's a far going speculation. Does he even state anywhere that Jessica Garza is his daughter, or even that he has a daughter, who is married?
Yeah, the family link is iffy there, but the fact that Fraser was involved in GAW since early days kind of puts Josh's whole "self-made millionaire" act into question, as well as the latest story about VCs scrambling to throw millions into a coin without reading a single page. Looks like it's just a "family & friends" small business. Not that there is anything wrong with that, just maybe not quite matching the image that's being painted.