Help getting started with Roku devices, including setup, connecting your device to your TV, linking a Roku device to your account at my.roku.com/link, adding channels, subscribing to services, and more.
Recognize that the channels you install are tied to your ACCOUNT, not to individual devices. Add a channel to one, you add it to all channels on the account. Delete from one, delete from all.
Your s.i.l. might be better off with her own account at Roku.com so she can control her channel selection separately from yours. There is no charge for setting up a Roku account. Do a factory reset on the unit so you can set it up for the new account.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T