Will having a portable router in my house slow down my current internet?

I already have a router and wifi provided by Verizon, but my brother is complaining that my devices are using up all the wifi (specifically my xbox). Would getting a portable router slow down our current wifi even more or would it be okay? Also, I know that they re small but do you think one would be able to... show more I already have a router and wifi provided by Verizon, but my brother is complaining that my devices are using up all the wifi
(specifically my xbox).

Would getting a portable router slow down our current wifi even more or would it be okay? Also, I know that they re small but do you think one would be able to support simply watching Hulu on an xbox?
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