I'd give this one 6 *'s -- 3 or 4, per se, and a couple of additional ones for its fascination in its mediocrity, and because of Ward and O'Quinn in the cast.
Like others here, even given its being filmed for basic cable, and not meaning to be overly-prurient, there could have been some steamier scenes between the gorgeous Ward and the hunky stepson, Morrow --- both age appropriate (often not so in this type of film), 40-ish and early 20's, respectively, and both immensely attractive. The director also could have elicited a bit more chemistry between the two.
The ending is certainly silly, but then, most of the endings of these type TV flicks have silly endings, whether the crazy neighbor or babysitter wielding a kitchen knife, or some supposed "twist," revealing a surprise turn in terms of perpetrator/motive. The former can be anticipated from a "mile away;" the latter perhaps a "half mile," which was the case here.