Gardai now believe that Sean Sweeney and his son Lee might have slipped and fallen into the canal’s waters from a height of about 10ft. Forensic experts also think that their bodies were in the water since the night before.
While the exact circumstances of the tragedy are not yet clear, Gardai are treating the event as an accident.
Local residents have left flowers, Easter eggs, teddy bears and other mementos around the area.
It is understood the events unfolded after Mr. Sweeney went through a broken fence as a shortcut to get to the other side of the stream, but he somehow lost his footing and fell in.
Labour Party councillor Brendan Carr said that another young child drowned in the same spot a few years back. The councillor is now calling for Dublin City Council to put safety measures in place.
Speaking on Newstalk, Cllr Carr said: “I would like to offer my support to the families affected by this because it is a terrible tragedy, it’s shocked the whole area in fairness.
“We’ll be calling on Iarnród Éireann and the City Council to sit down, we’ve asked them this before and we need both parties to sit down at this stage and come to some sort of resolution for this particular track.”