Doing a search at familysearch.org I came across other children as well as daughter Iona for this couple. Birth/death records Ontario,Canada. On all these records Father is Robert Cook and Mother I will add to each record as their are variations.
Charlotte Ann Cook female birth 7th feb 1889 Sundridge,Parry Sound,Ontario Mother Roxy Rebecca Curry
Robert Grey Cook male birth 9th feb 1894 Muskoka & Parry Sound Mother Roxy Curry
Laura Violet Cook female birth 7th may 1898 Parry Sound Mother Roxy