Yeah it's similar to if a ghost has been "culled"; they're gone from the relationship panel. Your sim's children will be able to recognise a "strange connection" to your reborn sim though, and they can still mourn at their original grave or urn.
I agree that it would be a lovely addition to be able to hold funerals even if the dead sim is reborn or has been culled. I'd like to be able to hold memorial events for sims who have passed on to the "great beyond". The problem is the ghost is meant to show up to the funeral though.
As a workaround, if you have Seasons, I sometimes name a holiday after my fave sims as a memorial day. I use "attend ceremony" and "remembrance" as two of the activities. The sims go off as if to a memorial service, and interact with the sim's grave. I used to do this before we had funerals.
I js want her back ngl i wasnt expecting a complete disapearqamve
