My Tom CK lost his sister today, should I get him another one or wait awhile?

An ill-timed trip across the street in front of my house proved fatal to my littlest, Splotch. My neighbor has a litter, and they are actually CK’s siblings. Since he and Splotch were such pals I am wondering if he will miss her, at least as much we humans, anyhow. I don’t know if getting Ck another sibling will make him as happy as he seem to be, but I am thinking maybe I should try. There is not a chance of keeping it a house cat. They new litter will not be ready for another five weeks. At the moment I am all bumped in the head of the events and the death. I don’t know if at the moment I could embrace another kitten as well as Splotch, at the moment, the future maybe different. I hate CK being without a romp around pal. If it were you would you wait to see how well CK rebounds, or would you skip the opportunity because you might not fell as close to the replacement kitty? Would the fact that the mother is getting fixed when this litter is done and there will never be a chance to get him an actual relative make a difference?