Its lawyer Peter McKenzie QC told the High Court in Wellington a review in 2010 granted continued charity status.
He said Family First operated in the same way now as it did when that decision was made.
The group was first registered as a charity in 2007.
Family First spokesman Bob McCoskrie said campaigns against controversial legislation including the anti-smacking law and the same-sex marriage law did not sit well with the board.
"Those say that our view is controversial in contemporary New Zealand society and therefore we don't serve a public benefit," Mr McCoskrie told Newstalk ZB.
According to the Charities Register, Family First claimed to work in the "community development, social services, promotion of volunteering" and "family/whanau" sectors.
The registration details said the group's beneficiaries included children and young people and the "general public."
Family First has also published views on social policy debates and politically-charged issues such as abortion, medical marijuana, sex education and prostitution this year.
- additional reporting Newstalk ZB