Mucha had two younger sisters, Anna and Angela, as well as three half-siblings from his father’s previous marriage. After leaving home at the age of 19 he maintained strong ties with his family and friends in Moravia.

Anna was particularly close to Mucha, regularly exchanging letters with him. In 1885 she married his friend Filip Kubr, a Czech patriot, writer and publisher, and Mucha made many illustrations for his brother-in-law’s satirical magazines, Slon and Krokodíl.