Cecil's "brother" [note i] Jerricho is, indeed alive, . . . and even better he is protecting Cecil's cubs.
There were some expectations that Jerricho might take over the pride and kill offspring not his own, or that another male lion might take over the pride and do likewise. . . . but Jerricho has proven to be a benevolent and capable leader.
Johnny Rodrigues, chairman of the Zimbabwe Conservation Task Force reports "'Everything is fine, Jericho has taken over the pride and all the cubs are safe.
If the pride was going to be taken over by a rival lion, it would have happened by now."
Ref: Jerricho Assumes Leadership Roll
note i: "It is also important to note that Jericho is a 'coalition' partner to Cecil and not a blood related sibling."
Ref: The Telegraph