The fear is common and nobody says it out loud
Almost every family wonders whether the ashes they receive are really their person. Very few ask, because the question feels like an accusation. It is not — it is the obvious question about an irreversible process carried out somewhere you cannot see, and any provider worth using will answer it plainly.
What the procedure looks like
Identification at transfer. The person is identified at the place of death and tagged before leaving. A numbered disc. A stainless or ceramic identification disc, stamped with a unique number, is assigned and stays physically with the body from that point. Single occupancy. A retort holds one person at a time; commingling is prohibited. A log. Every handover is signed and timed, so any point in the chain can be reconstructed afterwards.
The disc is the part families find most reassuring, because it survives the process. It comes back in the container with the ashes, and you can hold it and check the number against your paperwork.
What to ask
Ask three things. Do you own and operate your own crematory, or is the cremation subcontracted? What is your identification procedure from transfer to return? And will the identification disc be returned with the remains? A provider who cannot answer the second question in specific terms is not describing a system they actually run.
If the cremation is subcontracted, that is not disqualifying, but you should be told, and you should be told where.
Witnessing
If the answers do not settle it, ask to witness. Being present for the beginning of the cremation is available at many facilities and resolves the question completely. The witnessing post covers what that involves.