Sanja je rođena i odrasla u Zagrebu, no njezini korijeni sežu u različite krajeve. Njezin otac Ivan, koji je preminuo prošle godine, podrijetlom je iz Lišana Ostrovičkih, mjesta smještenog u zadarskom zaleđu. S druge strane, njezina majka Ana potječe iz Broćanca, naselja u zaleđu Neuma. Sanja nije jedino dijete u obitelji – njezini roditelji, Ivan i Ana Musić, dobili su i sina Tomislava
Zoran Milanović was inaugurated as President, with many family members attending, including his wife Sanja Musić Milanović, their sons, and other relatives. Sanja's father, Ivan Musić, passed away last year, and she has a brother, Tomislav, who is involved in the family's construction business. Tomislav's wife, Rina, has a notable career in the pharmaceutical industry, and they have two daughters. Despite personal losses, the Milanović family remains close-knit.
