Before you return to Southfork with the Ewing family during TNT's "Dallas" reboot, take the time to get reacquainted with the oil-loving family.

TNT has released a "refresher course" video for the "Dallas" reboot. After all, it's been about 20 years since viewers saw J.R. and Bobby Ewing in action.

"I'm usually surprised by at least one fact about our family tree," Patrick Duffy says in the video below. Speaking of the Ewing family tree, HuffPost TV has a handy Ewing guide to help keep who's who (and who is sleeping/slept together) straight. There's a whole lot of history at that ranch.

TNT's "Dallas" reboot premieres Wed., June 13 at 9 p.m. ET.

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