A 25-year-old man is due to appear in court this morning accused of stabbing his parents in north Dublin.
David Dignam and Phyliss Dreelan were injured during the stab attack at their home in Darndale over the weekend.
Gardai believe that the couple were set upon as they slept in a downstairs room shortly after 7am on Saturday.
Mr Dignam, in his 40s, was stabbed at least 10 times in the neck, shoulder and chest, while Ms Dreelan, in her 50s, also suffered knife wounds attempting to come to his aid.
A family member alerted gardai, who arrested the suspect close to the scene at Snowdrop Walk a short time later.
The 25-year-old, understood to be the couple's son, was quizzed at Coolock Garda Station over the weekend and is due to be charged with two counts of assault causing harm, as well as producing a weapon.
He is expected to appear before Dublin District Court in the Criminal Courts of Justice this morning.
Detectives have also found a large kitchen knife they believe was used during the attack.
They are still attempting to establish a motive in relation to the incident, and are investigating reports that the suspect may have taken drugs in the hours before the incident.
"Why this happened isn't yet clear - it was a very violent assault and the male still remains in a serious condition in hospital," a senior source told the Herald.
"Early indications are that the couple were attacked while they slept on a couch in the sitting room," the source added.
Initially, Mr Dignam had been described as being in a critical condition and Ms Dreelan as having non-life threatening injuries.
However, his condition has since been upgraded to stable.
Both are continuing to receive treatment at Beaumont Hospital.
The house was sealed off for a technical examination by forensic officers.
A garda spokesman said: "A man in his 20s arrested following a stabbing incident in Darndale remains in Garda custody.
"He is expected to appear before a sitting of Dublin District Court on Monday, June 15, at 10.30am to face charges in connection with the investigation."