Vinayak and Kavin

Kavin and Vinayak are cousins from two sides(maternal as well as paternal).
How much Kavin loves Vinayak-we got to know only when the other day we were watching Kavin's baby and toddler videos.In each of the video,Kavin kept on telling (even though he couldn't speak properly) that he wants to see Vinayak's video in the camera.
He kept on telling--"Bu___Bu" in some."Biya(Bhaiya)" in others.
And even as we were watching his videos,he was asking me to put on Bubu's video.It's so endearing.