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"...rather then mother?" Seriously?
No, NOT seriously. It was a typo.
Haven't you ever typed the wrong word which happens to sound like the word you meant? It's like my fingers heard what I said in my head, and picked the wrong word. I am a grammar cop myself. It's very strange when I catch myself in things like this. It's not the first time though this has happened, and it's strange every time.
You have to be so good at typing that your fingers have a mind of their own. If you're deliberately typing words out (hunt and peck on a phone, for example) it's not going to happen ever. Then you have a different problem instead: autocorrect!