National Son's and Daughter's Day is celebrated in the United States on August 11. It is not considered an official holiday as of 2014, and it's origin is unknown.
The idea behind Son's and Daughter's Day is the same as Mother's Day or Father's Day. It encourages appreciating family members and spending time with them. A gift is not necessary. Greeting cards are available specifically for the day, but there is no traditional greeting since it is an unofficial holiday. It is similar to Take Our Sons and Daughters to Work Day, which was created in 1992, but only included girls until being expanded to include boys in 2003. However, many companies allowed boys and girls to participate before the day was officially expanded. That day occurs on the fourth Thursday of April. It was designed to help children explore different life and career options. The Ms. Foundation for Women, which created Take Our Daughters to Work Day, also designed the program to address girls' self esteem issues and show them different career options. Children from residential programs and shelters are often invited to see career options they may not be exposed to otherwise. It is aimed at children between the ages of 8 to 18.