They died at their Kerry home last week, and along with Michael O'Sullivan, beside whose remains was found a shotgun.
The funeral service for Eileen O'Sullivan and her son Jamie, who were found dead at their home in Lixnaw in Co Kerry last week, will take place next Monday.
A private family funeral will be held in St Michael's Church in Lixnaw, followed by burial in Kilfeighney Cemetery.
Eileen's partner Maurice was also found dead at the scene last Tuesday, and it's believed he took his own life after shooting both Eileen and Jamie.
Funeral arrangements for Maurice have not yet been announced.
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