Some thoughts on the Ancestry DNA kit:
It may not be significant to the case and may simply be something Kelsey wanted to do. I think many Seventh Day Adventist's find it important to research their family history because there are some SDA genealogy research websites such as this one:
Genealogy Research | Center for Adventist Research
That said, I wonder if perhaps after PF's father died Kelsey asked some questions about his father's side of the family and perhaps PF said he didn't know much about his father's ancestors. I can see KB ordering the Ancestry DNA test kit as an innocent gesture to try to help PF learn more about his roots. They could test baby K's DNA and find out more about both sides of their family that way. I don't have any doubts that baby K is KB and PF's biological child. But what I am wondering about is if there are any skeletons in PF's family closet that might have come out with an Ancestry DNA test.
Sometimes people test and get some surprises in the DNA relative matches-- half siblings, adopted siblings, 1st cousins that they never knew about, etc. If a sibling was ever adopted away or a parent or grandparent strayed it may be revealed if the right person also submitted a DNA kit to Ancestry. And if KB knew about GEDmatch and had plans to upload the Ancestry DNA file there then the results could be used by LE in the future to solve cold cases. If anyone in PF's immediate family is a serial criminal (including PF) they could potentially be outed by his daughter's DNA info being uploaded to GEDmatch. Although it is not yet standard, it is becoming more common for cold cases to be solved with genealogical DNA. Anyone who has read about the arrest of the Golden State Killer would be aware of that possibility.
Perhaps PF knew some family secrets and didn't want KB (and others) to find out.
Perhaps he took the DNA test kit from KB's mail to keep her from testing baby K but knew that wouldn't work forever. I believe this issue could be another reason he wanted to get sole custody of baby K. And it could also be a motive for his family members to try to help him get full custody of baby K. And if it's something really serious it could be a motive for family and "non-family" to either help cover up or turn a blind eye on PF murdering KB. I hope that Cheryl will consider submitting an Ancestry DNA test of Baby K (in KB's honor) as soon as she is granted permanent legal guardianship. The results could be interesting.
MOO.