Foy. Such a natural performance and very believable as this inquisitive child.
Chastain was too focused on trying to make the character a complex one, which I found to be very redundant. Burstyn was able to create her own character for the short amount of time she had, but she totally convinced me that she was the daughter of McConaughey.
Chastain had some REALLY great moments, but some felt a bit...melodramatic? Maybe it was the scripting. I didn't like when she is looking at the chalk boards talking to Michael Caine. It felt like it was written. However, I LOVE when she is arguing with Affleck and she yells "dad's not coming back!" and of course her 23 years later video message is great.