If he's the best player available, I'd draft him. Let him play one season or so with his brother, then see if you can move one of them for a player who provides something different. This was my thought in the draft thread...
If the Kings were to draft Kris Murray as best player available....and he looks like he's lets say 85-90% of the NBA player that his brother is at a future point in time, would you then consider trading Keegan for a player that you believe turns the Kings into a real contender?
I have a hard time picturing getting the most out of the Murray twins on the same NBA team, for more than 1 season together.
Maybe not a popular feel good move initially,... but trading Haliburton probably wasn't either