Rey is Luke’s Daughter. Luke fell into the trap of love like his father, the mother ran when things went bad at Jedi camp ( Ben Solo) and dumped her on Jakku. Obi Wan’s voice(s) in the light saber montage means she will be guided by the force. At the end of Ep7 , Luke senses the need to enter the fight, continue training Jedi and that Rey is his daughter.
Now , wouldn’t it be cool if they did a Clone wars type series of the adventures of Rey, Luke, Chewie and R2?