Tanaiste Simon Harris is describing the latest threat against his family as "sinister."
It's the second time in a week a member of his family has been targeted.
The Tánaiste Simon Harris says there is a very apparent motivation to intimidate him out of public office.
Last week, direct threats were made against his children and he says late on Friday night vile and horrific threats were directed at a very close family member.
Gardaí are investigating the online threat which was made on social media.
Simon Harris says what he and his family have faced in recent weeks is not political debate, it's abuse and intimidation.
He says protecting his family will remain his number one priority and he will consult with colleagues about these threats and what action to take.