New DUP MLA Stephen Dunne has taken up his seat at Stormont in place of his father just over a week after his death.
Gordon Dunne, 62, died 11 days after stepping aside from his North Down MLA role due to serious illness.
His son Stephen was chosen as his successor and on Monday he signed the roll of members.
The 32-year-old said it has been a "challenging" time for his family but they have been "hugely heartened" by the well-wishes they have received.
The former Ards and North Down councillor said he wants to "build a better and more secure future for everyone".
"It was an honour today to take my place as a DUP MLA for North Down," he said.
"This has been a very challenging period for our family, but we have been hugely heartened by the many good wishes of people from right across the political spectrum.
"There are many challenges facing Northern Ireland currently and I do not underestimate the significance of those in the days and weeks ahead.
"As one of the youngest members of the Northern Ireland Assembly I want to help build a better and more secure future for everyone here as we move into Northern Ireland's second century.
"I look forward to working as part of the DUP team within the Assembly and to ensure that North Down's voice continues to be heard in the decision-making process."
