Something that concerns me (Regarding IP)

Recently, My sister joined officialy the server and Registered her account Howeber, There is the fact that we live in the same house,and also the both are registered, so the thing here is that

Can be an IP confusion due being from the same router, even that we play on completly different devices, ending in a mistake ban?

If yes, there is a way to prevent a confusion, like letting the staff preview the IP so they can mark it or something?