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Four sisters
Very little is known about Carrie Underwood's sisters
The March Sisters in Louisa Alcott's 'Little Women'
The four March sisters in "Little Women" are Meg, Jo, Beth, and Amy.
The Laurence family
Amy
Little Women
There are 4 children: Meg, Jo, Beth, and Amy in Little Women.
There is no patron saint of little sisters or big sisters.
Joelle, Beth, Amy, and Meg an interesting side note on these names. They are also the names of the Sisters in the Book Little Women.
Nuns are solemnly professed religious sisters who live in a monastery, usually called an Abbey. Please note that Nuns are NOT Sisters. Sisters in the Catholic Church are religious women who take perpetual or simple promises, and usually live in a convent, teaching or nursing.