system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Does Thanos know that Gamora is in the Guardians of the Galaxy?

It seems like he might be interested that his favorite daughter has gone on to become a space superhero.
gpt
He (Thanos) mentioned that her favorite daughter betrayed her after getting imprisoned.  Nebula also knew who she was hanging around with and very likely reported that to Thanos.

And if he didn't know in the first Movie, it's not like its a big secret.