Grand-mother

His grand-mother knocked him down.

Source: tatoeba (861093)

I will have time for my grand-mother tomorrow.

Source: tatoeba (11284577)

I ſhould ſinne / To thinke but Noblie of my Grand-mother, / Good wombes haue borne bad ſonnes.

Source: wiktionary

But ah, how great would be their aſtoniſhment and horror, when informed, that numbers of thoſe young perſons, whoſe behaviour was ſo unbecoming, had not been taught by their mothers, their grand-mothers, or any female friend in the world, one ſolid lesson of wiſdom, frugality, or amiable reſerve.

Source: wiktionary