御祖母さん[obaasan] grandmother
お母[ofukuro] one's mother
御母さん[okaasan] mother
お母さま[okaasama] mother
異母[ibo] different mother

雲母[unmo] mica
義母[gibo] mother-in-law
空母[kuubo] aircraft carrier
継母[keibo] stepmother
賢母[kenbo] wise mother

御祖父さん[ojiisan] grandfather
御父さん[otossan] father
異父[ifu] same mother, different father
家父長制[kafuchousei] patriarchal authority
外祖父[gaisofu] maternal grandfather

岳父[gakufu] (man's) father-in-law
杜父魚[tofugyo] sculpin (any fish of family Cottidae, inc. the bullheads and the miller's-thumb)
義父[gifu] father-in-law
教父[kyoufu] godfather
継父[keifu] stepfather

許りに[bakarini] (simply) because
允許[inkyo] permission
運転免許[untenmenkyo] driver's license
奥許し[okuyurushi] secret
仮免許[karimenkyo] temporary license

官許[kankyo] official licence
気を許す[kiwoyurusu] to let one's guard down
許し[yurushi] pardon
許す[yurusu] to permit