JMO: A responding officer who walks into a crime scene is unlikely to say to report that there are multiple spent rounds if there is one man down with one bullet wound (or two). He also says “spent rounds,” which implies he saw casings vs estimating the number of shots from evidence such as wounds to the victim(s) and other damage.
If the reporting is accurate, the officer likely called the initial report upon finding the father, before locating the mother (and ultimately determining that Jayme was missing). The timing also indicates that the reporting officer was not using the term “multiple” to mean “any number more than one, including two.” Although that definition is accurate in a grammatical sense, it doesn’t fit contextually.
I believe the ‘multiple spent rounds’ indicates more shots were fired than the two reported by the neighbors. MOO.