Grandnephew rhymes with:
nephew, leffew, nephew, curfew, leffew, morphew, nephew, abiquiu, accu, argue, ayscue, belue, ceaucescu, ceausescu, compu, continue, curfew, discontinue, donoghue, edu, eigenvalue, escue, eskew, florescue, harju, haskew, immu, ingenue, kadrescu, kismayu, lahue, leffew, lehew, maheu, maruyu, mathew, mathieu, matthew, mayhew, menu, merithew, merrihew, minchew, morphew, nephew, o'donohue, odonoghue, odonohue, overvalue, popu, raju, rearview, rescue, seiyu, supervalu, tequiliu, tokyu, undervalue, valu, value, venue, w, w., wilthew