Jimmy and Kathleen Cuddihy, who were in their 70s, were found dead in their home just outside Carndonagh on Thursday the 23rd of October.
42 year old Julian Cuddihy, appeared at a special sitting of Letterkenny District Court today.
In court, Julian Cuddihy's solicitor said that the psychological assessment of his client, which had been ordered at a previous sitting, had not yet taken place, because Castlerea prison does not have the facilities to carry out such an assessment.
The judge insisted the assessment was needed "as soon as possible".
Mr Cuddihy was remanded in custody.