What is another word for "grandfather"?

Roget's Thesaurus (1911) lists these synonyms for "grandfather": abba, ancestor, ancestral, ancestry, birth, centenarian, clan, consanguinity, crone, dad, dam, descent, dotard, extraction, family, father, fatherhood, fathership, gaffer, gammer, genealogy, genitor, grandam, grandmother, grandsire, graybeard, great, happy, house, line, lineage, linear, mamma, man, maternal, maternity, mother, motherhood, non, nonagenarian.