I am not sure if this helps with your concern, but there is a turn of events in which they do not turn up dead. If you just let them go their merry way, you won't find corpses and Auntie will say something about them being at a farm.
Thank you.
I meant the course of events where they is dead, but for a reason unknown to me, their bodies(one or both of them) disappear from the game. There is a red bloodstain, but no bodies. (and hence no way to talk to them).It doesn't always happen, but I couldn't figure out what it depends on.
If you flee combat and return later (after long resting) the cub will be gone and can be found at the goblin camp and recruited as normal. It's still a bug, but this workaround lets you recruit this very important companion.
Thank you. I was afraid if I escaped, he would remain hostile and replayed this fight until baby's mother forgot to summon a helper. Then the further quest goes correctly.