In response, Amber said that she did not want Demi to think that she ever wanted anything from her. When she found out about her secret older sister, she asked her why she did not try to contact her. She spoke to her for the first time when she was 20 years old. (Source: ) Relationship With Demi Lovatoĭemi did not know about Amber until 2013. She is an actress who is best known for her role as Juanita Solis in the T.V. Madison is her step sibling born to her stepmother Dianna and her second husband, Eddie De La Garza. She has three siblings, namely Demi Lovato, Dallas Lovato, and Madison De La Garza.ĭemi and Dallas are her half-sisters who were born to parents Patrick Lovato and Dianna De La Garza. She is the half-sister of singer, songwriter, and actress Demi Lovato. Amber Lovato is one of those celebrities who is famous for being the sibling of a well-known celebrity.