Rugadh agus tógadh Sarah Ghriallais i Muiceanach Idir Dhá Sháile, i nGaeltacht Chonamara, ceantar a bhfuil cáil air mar gheall ar a chuid amhránaíochta, rince agus ceoil. Tá clú agus cáil bainte amach ag Sarah mar fhonnadóir agus is iomaí comórtas atá buaite aici ag Oireachtas na nGael agus ag Oireachtas na Gaeilge, ina measc, an gradam mór le rá, Corn Uí Riada. Duine de thrí dhuine dhéag clainne í Sarah agus is óna muintir, Máire Cheaitín and Pádhraic Griallais, a thóg sí féin na hamhráin agus an sean-nós.

Sarah Grealish was born and raised in Muiceanach Idir Dhá Sháile in the Connemara Gaeltacht, a region known for its song, dance and music. Sarah is a renowned singer and has won multiple singing competitions at Oireachtas na nGael and Oireachtas na Gaeilge, including the prestigious Corn Uí Riada. Coming from a family of thirteen children, her parents Máire Cheaitín and Pádhraic Griallais were both singers and the home was where she learned sean nós songs and how to sing them.