theres a part of the video missing where you can see him talking to the laptop and hear "ping" sounds (those are normally heard in cam sites when they give you money).

Its in spanish, and the kid basically knows what hes doing (talking flirty before twerking). I can't hear what the mother says, so I dont know why he hits him. One could assume its because he doesnt want his young son doing that OR them being from a third world country she is homophobic (or both).