Search crews found Brian and Harper Floyd on Tuesday in the woods of the Ouachita Mountains, south of Blue Mountain Lake in Yell county.
Now, the child's mother is being called the only person of interest. Brooke Floyd was initially arrested for endangering a minor and hindering apprehension, but the sheriff says more charges could be possible.
Floyd has her first court appearance set for next week but no official charges have been filed yet.
Meanwhile, the memorial service for Brian Floyd is set for Saturday, August 1, at 2:00 p.m. in Fort Smith.
According to Floyd's obituary, it's at Community Bible Church on Dallas street in Fort Smith.