According to this link – Cremation: Important Questions to Ask – it seems that some few Pennsylvania facilities (funeral homes and crematoriums) do allow families to be present for the cremation. Another article I'd seen says that that practice is being examined by PA Commonwealth court.

Here's an excerpt from another article, found here: Quick Response to Crematory Horror:  "Tri-State [Crematorium] worked only with funeral homes, and under Georgia law only crematories that deal directly with the public have to be inspected." So it seems that some Georgia crematories do have direct contact with the bereaved; this place, however; was not one of them.