After not seeing her dad's family for years, and not her cousins since she was a baby, we re-connected with them at her dad's funeral and I found out that the youngest of ex-SIL's grown children is now a transman. I didn't talk to DD (8yrs) about it at the time because obviously there were bigger things on our minds then but we're planning on getting together with ex-SIL and DD's cousins and I don't know how to explain to DD. I don't want to say anything that she might then repeat that will upset anyone but I also want to be honest with her.