The Sinn Féin President has confirmed she is to speak to Breege Quinn, the mother of murdered Paul Quinn on Thursday.
Mary Lou McDonald says she is to be speak to Mrs Quinn by phone at 5:30pm amid ongoing controversy over comments made by her party colleague Conor Murphy.
When asked whether she had found the last few days of the campaign hard, considering the ongoing controversy, Ms McDonald said her priority was the Quinn family.
"Any time you're asked to deal with something that involved trauma or loss for any family, of course it's hard, I'm a human being and I'm also a mother," she said.
"It doesn't come any more difficult than a mother who has lost her child in such a brutal way."
A senior DUP MP has called for a Sinn Féin Stormont minister Mr Murphy to quit or be sacked over his controversial claims about the IRA murder victim.
Sammy Wilson's remarks appear at odds with the DUP leadership, which has stopped short of calling for Conor Murphy's removal as finance minister.
Mr Murphy apologised on Wednesday for comments made 13 years ago in the wake of Paul Quinn's murder when he branded the South Armagh man a smuggler and criminal.
The brutal murder of Mr Quinn, and Sinn Féin 'sresponse to it, has become a major issue in the Irish General Election campaign, with rivals claiming it is proof of the party's continued defence of IRA violence.
Mr Murphy's apology represented a dramatic change in position as prior to that he had denied even making the comments about Mr Quinn.
Mr Quinn, a 21-year-old from Cullyhanna in south Armagh, was beaten to death by a gang of around a dozen men in a farm shed across the border near Castleblayney, Co Monaghan.
His family blame members of the IRA, but Sinn Féin has long denied republican involvement.
A month after the murder, Mr Murphy, a Sinn Féin representative for Newry and Armagh, claimed Mr Quinn was involved in "smuggling and criminality".
While Mr Quinn's family and other political representatives have demanded Mr Murphy's resignation, DUP leader Arlene Foster declined to add her voice to those calls when she appeared before an Assembly committee on Wednesday.
Sinn Fein President Mary Lou McDonald has insisted Mr Murphy will be staying in post.
There is a sense the DUP leadership is keen not to destabilise the newly-restored powersharing administration by adopting such a confrontational approach with its main coalition partner.
The controversy has also erupted weeks before the publication of a public inquiry report on the botched Renewable Heat Incentive scheme - an event that is anticipated to place Mrs Foster and party advisers in an uncomfortable political position.
Mr Wilson and several party colleagues now appear to have broken ranks on the issue of Mr Murphy's future.
On Thursday, he tweeted: "Despite SF's continual calls for transparency, integrity and accountability, they have once again illustrated that they will always side with the terrorist and not the victim. If they have any decency, Conor Murphy should be required to resign or be sacked."
His comments follow a similar message on Twitter from DUP MLA Paul Frew, who is chairman of Mr Murphy's Assembly scrutiny committee.
"The Quinn family have lived through a tortuous period of grief at the tragic loss & murder of their son compounded by the slur, alienated by the Republican movement. If the Quinn family say Conor Murphy should resign, he shouldn't have time to get his coat."
That tweet was subsequently retweeted by fellow DUP MLA Jonathan Buckley.
Mr Quinn's parents Breege and Stephen have said Mr Murphy's apology did not go far enough and have called on him to explicitly state that their son was not a criminal.
Fianna Fail candidate Jim O'Callaghan also called on Mr Murphy to resign over his controversial claims.
Speaking in Dublin on Thursday, Mr O'Callaghan said: "Yes, I think Conor Murphy should resign.
"If his apology was genuine he would have issued it to the Quinn family 13 years ago.
"His apology was designed to protect and promote the interests of Sinn Fein in the run up to the General Election.
"What it reveals is that whenever there is a conflict between the chance of a family seeking justice on the one hand or people seeking justice on the one hand or the people in the provisional IRA or people involved in crime on the other hand, Sinn Fein always opts for the latter."
