Yes, it's two separate incidents. Pharo's SA happened when she was around twelve.
Reva got pregnant at 17, when she had sex with Billy. Mindy's mother had died, and Josh went off to college at Berkley. I've never heard a direct reference to the gap between Billy, Trish and Josh. But from the way Josh occasionally referenced their childhood (watching Billy in high school football games, while he ran up and down the sidelines for example), I'd say there's supposed to be at least six years between Billy and Josh. Reva's at least a year younger, since Josh was going to college and she got pregnant at 17. I can't stomach the scenes around Dylan's conception (Reva is just ticking me off in the present as she remembers the past and having concocted the rape story for Sarah's benefit), but I think she may be talking about how Josh didn't come back to Oklahoma the summer after his first year at college.
One of the few references to Mindy's mother happens when Billy tells Phillip that he had gotten Mindy's mother pregnant and they'd had to get married. It sounded like that was during his college years.
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P.J. ·