in his good graces,

[keannu]

What do you mean by "in one's good graces"? She is talking about her dead brother, Eric, who was very selfish, not caring about others. And she seems to be talking about his strengths.

gw13
00:37:31 Because he was my brother.
00:37:34 And because he had something.
00:37:37 I don't know, when you were in his good graces,
00:37:40 you felt like you were really...
00:37:43 really special
00:37:46 You know, I kept thinking that, um...
00:37:48 if he could see how much I loved him that maybe one day he would love me back.

 

[emsr2d2]

It means "when you were in his favour", "when he liked you", or similar.