Grandfathering rhymes with:
bothering, dithering, fathering, feathering, furthering, gathering, mothering, slathering, slithering, smothering, weathering, withering, wuthering
bothering, dithering, fathering, feathering, furthering, gathering, mothering, slathering, slithering, smothering, weathering, withering, wuthering