Reason: While 'milf' stands for 'Mom I'd Like to Fuck', a milf being in an image doesn't necessarily mean that there are children in the image that can be attributed to her. One can infer from actions in the photo (doing laundry, cooking, etc.), but again there's no guarantee that those are occurring in the picture.

Essentially, milf implying mother doesn't fit in with TWYS, despite being an acronym for mother I'd like to fuck.