The 1940 census shows this:;

Jean Cappiello born abt. 1935 lived in Phil. PA with parents Daniel and Christine.

Louise b. 1930 Josephine b. 1928 were sisters whose father was Louis Cappiello
They lived in Phil.

Rachel Cappiello b. abt 1928 lived with mother patsy in New Castle

Any of these could be right age. There are other Cappiello daughters but very old or too young.

You can search for Pa marriage records online in Pa as well as soc sec death index . You can put in Cappiello on Veromi and Phil and see what people live there now who you might contact. Pick older people to ask about this