yadi kadācid upalabdhe 'rthe saṃśayo 'nyatrābhāvaniścayastadāmunā nyāyena bhavato mātṛvivāhādessa{rasa}ttvamasaṃśayitaṃ prāpnoti /
If there can be doubt only regarding something that has been perceived at some time, and certainty of non-existence regarding everything else, then by this principle, the non-existence of your mother's marriage becomes established beyond doubt.