Two of Harriet's siblings have had long marriages but Harriet's brother Robert is on his third marriage; brother Harris divorced in 1997. Harriet never married.
I'm not sure what it means, but Texas death records state that Miers' father, Harris, was single when he died in 1973. News reports tell us that he was taken care of by his wife after he suffered a stroke in 1963.
In 1920, Harris Miers is living with his family in Dallas. By 1930, the family has scattered. Harris is lodging in a Dallas suburb and his brother, Hudson, is a boarder in Dallas. I haven't found his parents or other siblings in 1930.