The pair were found guilty of contempt of court last month.
Martina and Ammi Burke spent the night in the Dochas Centre in Dublin, after being arrested by Gardai yesterday.
The mother and sister of Enoch Burke were detained after visiting the controversial teacher at Castlerea Prison.
The pair were found guilty of contempt of court last month and a High Court order was issued for their arrest.
The Irish Mirror reports the women may have slept on the floor due to overcrowding at Mountjoy's women's prison.
Enoch Burke is currently detained at the Roscommon prison for breaching a court order by trespassing on the grounds of a Westmeath School.
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