Do siblings have rights to visitation when an aunt has custody of child under GA child custody laws

Siblings rights to vistation when an Aunt has custody.: I live in Georgia. My 1/2 sister (15 yrs old) also live here. My stepfather past away when I was 19. His mother and sister have custody of my 1/2 sister. I have been trying to reach her for sometime now but the mother and sister will not allow it for in fear of my mother coming back into my 1/2 sisters life. I have not had any contact with my mom in the last 5 years. I believe the mother of my step dad has past and now the aunt has my sister. Do siblings have more rights than Aunts as far as custody rights? I only want visitation with my 1/2 sister. - Is this your question? Add additional information