Dear Brother - Wishing you a Happy Birthday and many more to come. Your sister (Hazel Vera)
(Wish I could see you just one minute. Maybe I wouldn't blister you.)
On a lark, I decided to search the name of Rexford E. Holbrook. I don't do this very often, because before you know it you're researching other people's genealogy and there's no end. Interestingly enough, I found Hazel Vera before I found Rexford. Hazel was born in June, 1901, so she was 14 when she wrote this to her 7 year-old brother. But what's so very tragic is that Hazel Vera died on September 28, 1915, only a month after writing this. I have no idea what happened, but I'm glad that Hazel's memory lives on through this card.
Rexford lived longer. I don't know when he died, but he did get married. He and Hazel are both buried in the North Volney Cemetery in Oswego County, New York. Here's the information posted on rootsweb:
HOLBROOK, HAZEL V. lot 34
1901 1915
Born: June 3, 1901 Palermo, NY
Died: September 28, 1915
Father: Ephraim L. Holbrook
Mother: Bertha Curtis
(Vital Records Fulton)
Update: For the sad details of what happened to Hazel Vera, see Chris' comment below.