[Coach]

Originally Posted by AC

They certainly went out of their way to try and show that was the case IMO.

So much so that it may be a red herring.

Here are some hints that occurred as pointed out on Reddit:

Spoiler!

• Rey's speeder bike is a direct call back to Luke's X-34
• Rey has a handmade X-Wing pilot doll on a shelf in her home
• Rey makes her home inside a downed AT-AT walker, drawing a parallel with the AT-AT that Luke downed in Empire
• Rey is shown wearing a scavenged rebel pilot helmet, drawing another parallel to Luke. Note that Rey's helmet is not Luke's exact helmet as others have speculated. His had red rebellion logos, her's had yellow ones.
• Rey is shown to be a natural pilot and tinkerer
• Rey's force vision in the castle corridor was extremely similar to Luke's in the Dagobah cave. The same could be said for when Kylo was pursuing her through the crevace in the woods. Like vision Vader coming at Luke in the cave.
• Maz essentially comes out and says it post Rey's force vision
• As Kylo is interrogating her, he mentions he see that she dreams of an ocean and an island (where do we find luke?).
• Rey's garb in the closing scenes is very similar to Luke's from Dagobah. Both her vest and his jacket were heavier grey cloth and had mock collars. (I love this attention to detail)
• Both son and granddaughter were able to pull grandpa's light saber from the snow in dire times.
• Rey is the one who awakens R2D2. In the flashback she has, we see Luke placing his hand on R2D2. Why do we see that? I believe that this is the moment Luke decides that only Rey will be able to find him when she's old enough, and gives her a way to find him.

This is the quote I thought was supposed to be Maz specifically saying she's Luke's daughter:

"This lightsaber belonged to Luke Skywalker. Before that it belonged to his father. Now it's calling to you."

I think you're right about the red herring, and that Rey is Leia/Solo's daughter, and thus, Kylo Ren's sister. The phrase still applies.

My guess:

Spoiler!

In Rey's vision she is seemingly dropped of on Januuk(?) by Kylo, based on the voice. I think this probably happened when Kylo was quite a bit younger (late teens even?) as he was ordered to hunt down all force-users. Rey is his sister, so instead of killing her he dropped her on a deserted planet to protect her. She looked about 8 or 9 there. If he was late teens, they could be concievably be ~8-10 years apart.

The actors seem about the same age though, so who knows.