My sympathies to the friends and relatives.
I have had a couple of lessons at YSBK, (keeping my hand in while on holiday in Aus) and the triple parallel runway arrangement is not for the faint-hearted.
I was given 29C to land. On finals, I could see two other aircraft heading towards me from both left and right, cleared to land on 29R and 29L. I just had to hope they knew which runway they were headed for and turned final at the correct moment. I am sure that locals are used to it, but it is un-nerving for a visitor.
A sad event for all.