Some televisions have some of the functionality of a streaming box (e.g., Roku) built into them and depending on the services you want to use, may be sufficient alone. It really all depends on what you like. In any case, you're television or streaming box will need an network connection which can be over WiFi (or possibly hardwired with an Ethernet cable).

mike_kaiser, thank you very much. Now, the bigger problem is how not to hurt the feelings of my adoring and adorable niece.

Hope your New Year is going according to plan.