I think CTV post's about the family are wrong. John Peterson was born a Latham, as was Don Chapman. It looks like from RTE66's research that the girl Latham is not Jackie's child.
Apparently after Jackie and Lee married John took Peterson as his last name, no official confirmation of adoption found per RTE66.
Scott was born the year after Jackie and Lee married. John was born in 1966, Scott in 1972.
Laci Peterson Disappearance
Well, if Sue Ann Adams is Scott's sister-in-law, just which one of Scott's brothers is she married to?