Yes call is correct.
You should think about your turn value range.

Would Kx be value hand on the turn? Hardly, it will only called by king or better,
If only SB was following Kx could be the value hand that could be called by weaker hand pairs. But it's important to note that BB was coming along as well. BB's second call on the flop is basically saying "I have hand that not only beats BU's bluff but also beats SB's calling range... or FD", which would be at least K.
So you cannot extract value with your Kx on the turn, so your value range on the turn'd be
AA and 8.
On the river, theoretically correct play is call, BB's call is good thing because if SB was bluffing we'll most likely win against BB's 888KK. However AA is bottom of your value range and thus you're not going to raise with it.

However, practically,
1. SB won't be balanced at that spot. If SB is balanced, SB is turning flush or king into bluff and people don't do that usually.
2. will SB be overvaluing his king on the river? hardly likely. Try to think in SB's shoes, you called 3way pot twice with just king, and would you be worrying about value that you'd miss on the river and lead out? Maybe, if SB is not focusing on the game, but not too often.

There's no conclusion for these thoughts, but I believe call is most solid option and raise is least favorable option.

Thanks !

Your thought make a lot of sense for me, the lead on the river by SB have a lot of value, I think he doesn't do that with Kx he problably x/C, so the call is better than shove for me!

Sorry for my english ��