How do I change contact information?

I'm a first time iPhone user and already hating it. I attempted to pull my google account over and now my ex-wife is showing up in text threads as "mom" so clearly this is somehow related to my daughter's account. That being said, her iCloud account is not showing up as being on my phone. I'm looking in my google contacts and there is no contact under "mom" so why is this showing up and how do I change it back to her name?

See if anyone can convert me.