From left to right are: Kathryn E. Kennedy (1897-1974) who married Joseph O'Malley (1893-1985); Katherine Hill (1918-1991) who married Herman Van der Linde (1917-1975); and Mary Frances Kennedy (1898-1982) aka Mae Kennedy who married Walter M. Hill (1893-1965).
The photograph was taken around 1922-1923 when Katherine Hill was about 4 or 5 years old.
Image from the Ann Elizabeth O'Malley (1933- ) collection.