In something of an Abbot and Costello routine, quite a bit of the stealth Cuba provisions in the latest behemoth to pass through the congress is unclear. They were passed, but they're not going to be enacted. No, wait, the travel provisions will, but not the commercial stuff. I don't know. You can try to figure it out. Start at USA Today here.
What is clear is who can go. Under the old rules, only mother/father/ brother/sister could go or send money. This became problematic as the older generation of exiles died and the misery of the benighted island did not. Under the new rules, at least for travel to Cuba-
(b) For the purpose of this general license, the term close relative used with respect to any person means any individual related to that person by blood, marriage, or adoption who is no more than three generations removed from that person or from a common ancestor with that person.
Can't find guidance on cash remittances, yet.