S.C. Code § 53-3-40
The Governor is requested to issue annually a proclamation calling upon the State officials to display the United States flag and the flag of this State on all State and school buildings and the people of the State to display the flag at their homes, lodges, churches, places of business and other suitable places on the second Sunday in May, known as Mother's Day, founded by Anna Jarvis of Philadelphia, Pennsylvania, as a public expression of love and reverence for the homes of the State, especially for their mothers and other patriotic women therein, and the Governor is requested to urge the celebration of Mother's Day in such proclamation in such a way as will deepen home ties and inspire better homes and closer union between the State, its homes and their sons and daughters.
S.C. Code § 53-3-40