Dream of

So i had a dream that i had a brother who was really hot he was like 20 and i had a sister who was about 14 or 15. My 'brother' was apparently sexually abusing my 'sister' but he wasn't really they were both in love. One time i saw him touching her and kind of holding her tightly and i had this weird feeling and i'm not sure what it was. I think it was jealousy because in my dream i think i was in love with him. I've been thinking about this dream all day and i'm not sure what it means. I kind of recognise the 'brother' in it but i don't know where from.