Majken has known that she is a lesbian since she was 7 years old and Gabbi just recently found out that she's also into girls. But how about Gabbi's 10-year old sister Cleo, who is she in love with? Is it a girl or is it a boy? Cleo joins Gabbi to her girlfriend Majken's summerhouse. On a road trip up north a silent struggle begins between the older role models, who will gain Cleo's trust? My Gay Sister is a story about a young girls first meeting with the expectations to define her sexuality and about the ability to create, gain and lose trust for one another.