Alliance MLA Trevor Lunn has insisted he acted within the rules after confirming he employed his wife for research and clerical duties at taxpayers' expense.
Mr Lunn said he paid a Policing Board allowance to his wife for "support services". The Lagan Valley MLA gave no details of earnings. However, each party on the Policing Board receives a £16,000 allowance for research services.
Mr Lunn confirmed earlier in the week he had hired a member of his family to carry out research on his behalf as a Policing Board member, but refused to identify who the family member was.
On Wednesday the Alliance Party's press office said the individual could not be identified because of "security concerns".
Mr Lunn also told the Belfast Telegraph: "I am not interested in saying who this is.
"This is not secrecy. If anything, it has more to do with security."
Yesterday, in a statement released through the party's press office, Mr Lunn confirmed the relative was his wife.
"As this was a matter for Policing Board there was no requirement for me to declare this in the Assembly register of interest."
Mr Lunn did not respond to requests for an interview.