15 May 2012
The International Day of Families was proclaimed by the United Nations (UN) General Assembly in 1993, as a day to provide an opportunity to celebrate families. This day is celebrated on 15 May every year.It is supported by the UN’s Division for Social Policy and Development. The theme for this year’s International Day of Families is “Families Matter for the Achievement of Development Goals.”
References

United Nations, "International Day Families", From:United Nations,[online], Available at   undesadspd.org  [Accessed: 9 May 2014]|Universal Peace Federation, United Nations International Day of Families, from United Nations, [Online],Available at www.upf.org [ Accessed: 9 May 2014]