Good movie to hit the couch for with popcorn.
The many short flashbacks were annoying and many end questions for you to wonder mutliple outcomes for each character and further life.
I wished that sister as a 25 year old woman would have been treated with more respect. She is at an age where she would have been able to handle the truth, eventhough she wasn't seeking for any answers, which may be very odd not being curious about the meaning of her memories. This puts in doubt the mental stability and the maturity of her character.
Sandra Bullocks raw emotions and acting were on point at the revealing scene.
My question would be, would she ever dare to tell her sister the truth or is her love so great to keep it concealed?
Will she let go of the burden?
So, the end is open and as the viewer you will feel the need to make your own endings and hypothesis of what life will they go on and lead in the future.