Cherry, you've been on these sleuth boards for a long time, so do you think the Dad is innocent? I'm still on the fence.
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Well since Dad was an avg. working Joe we can rule out the gardner or handyman around the house.
She had thre adults looking out for her. And as CitzenM I think it was mentioned Dad kept his private life outside of the home which would count out his social circle.
Mom from the blip I caught was not out to take her was cool with Dad having custody.
I would look for someone that travelled through the neighborhood frequently or was involved with the child at school or other out of home activities on a regular basis.
Was 6pm the time she went missing?
That could be someone coming from a job going home or to a place near by that they passed by the house on a reg. basis.
Say John Doe who travelled through the neighborhood twice a week going from work to the local gym, who may have known her via school or church.
All speculation.
Prayers for all.