Can I hook up two routers to the same house on one internet connection?

I live with me ex. We have wireless internet already, which I pay for. But he won’t give me the new WiFi password. It’s complicated but he’s doing it out of spite. I have my own router from an old apartment. Can I just hook up my own router to the internet we have already? So we have two routers each with different... show more I live with me ex. We have wireless internet already, which I pay for. But he won’t give me the new WiFi password. It’s complicated but he’s doing it out of spite. I have my own router from an old apartment. Can I just hook up my own router to the internet we have already? So we have two routers each with different passwords.
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