LOR SAN TEKKA: I know where you come from. Before you called yourself Kylo Ren.
KYLO REN: The map to Skywalker. We know you've found it, and now you're going to give it to the First Order.
LOR SAN TEKKA: The First Order rose from the dark side...you did not.
KYLO REN: I'll show you the dark side.
LOR SAN TEKKA: You may try, but you cannot deny the truth that is your family.
Family isn't something you can walk away from. Okay, it is, but there's going to be consequences if you do. Lor is letting Kylo Ren know that he may wish to separate himself from his family, but they may have other ideas…and if he's not careful, that's going to muck up the whole Dark Lord of the Sith thing he's trying to get going.
REY: Don't give up. He still might show up. Whoever it is you're waiting for. Classified. I know all about waiting. For my family. They'll be back. One day.
This is Rey's defining trait early in the film. She waits for a long-lost family, hoping they'll come for her. They're not. Seriously, like ever. But that hope is all she has. It's what defines her…at least until a better option comes along.
MAZ: Whomever you're waiting for on Jakku, they're never coming back. But...there's someone who still could.
Regardless of who Rey's family really turns out to be, Luke is, in essence, her spiritual family: the guy who can give her that sense of belonging that she's missed and help guide her on the right path.
REN: And Han Solo. You feel like he's the father you never had. He would have disappointed you.
Daddy issues alert. Ren is motivated in large part because his father let him down. We're not privy to the reasons, but when dad's a career criminal with a habit of stepping out on his responsibilities, you can make an educated guess.
In response, Ren turns to another relative for inspiration: his grandpa.
REY: You...you're afraid...that you will never be as strong as...Darth Vader!
That mental interrogation thing works both ways, doesn't it, Ren? Rey pulls Ren's dark, dirty secret out of him and sheds a whole lot of light on why Ren is doing what he's doing. Daddy let you down, look to the elder generation to provide a path. (The irony, of course, is that Darth Vader eventually renounced the dark side and was redeemed. That may explain why Ren may have some conflicted feelings…)
REN: Forgive me. I feel it again. The pull to the light. Supreme Leader senses it. Show me again the power of the darkness, and I will let nothing stand in our way. Show me, Grandfather, and I will finish what you started.
It's interesting that, while Ren has completely abandoned his living family, he still clings to his dead gramps in order to feed his power. Seems he's not comfortable going it completely alone, and he still needs some contact with his family after all.
LEIA: No matter how much we fought, I've always hated watching you leave.
HAN: That's why I did it. So you'd miss me.
LEIA: I did miss you.
HAN: It wasn't all bad, was it? Huh? Some of it was...good.
LEIA: Pretty good.
HAN: Some things never change.
LEIA: True. You still drive me crazy.
Aw, you crazy kids. Family is blood, true, but family is also the people you welcome into your life…especially when you marry them and start a whole new family. These two have been bickering for a long time, but they clearly still love each other.
HAN: Listen to me, will you? I know every time you...every time you look at
me, you're reminded of him.
LEIA: You think I want to forget him? I want him back!
Neither Han nor Leia can forget their son, which is why they're willing to do anything to save him…even if that means leaving themselves open to an attack from him.
YOUNG REY: No, come back!
UNKAR PLUTT: Quiet, girl!
We don't know who's on that departing ship…and frankly, it doesn't matter. All that matters is that Rey feels abandoned by them, making them a family that wasn't there for her.
KYLO REN: Your son is gone. He was weak and foolish, like his father. So I destroyed him.
HAN: That's what Snoke wants you to believe, but it's not true. My son is alive.
Time will tell whether Han was right or not…though considering that Kylo Ren made a Han-kebab out of him, it will come too late for him if it does.