James and Jennifer Crumbley have presented a united front since their son carried out a mass shooting at Oxford High two years ago.
They were set to go on trial in January. But attorneys for the couple have argued new evidence has surfaced that could pit the parents against each other, and they each want their own day in court.
Prosecutors agreed with the request, though they express reservations about forcing victims of the families to re-live the traumatic events twice, during two trials.
The prosecution accuses the parents of being grossly negligent, alleging they ignored their son’s request for mental help and instead bought him a gun.
Defense attorneys contend the son lied about asking for counseling.