ATTN: Copyeditors and Grammar Fiends

A completely uncontroversial way to say that would be "a grandchild of Holocaust survivors."

And while - as mòokieproof says - it is fraught, it does seem a bit much to imply that you "survived" an event that you did not personally experience.

I am not, personally, a survivor of the Visigothic Sack of Rome, the Protestant Reformation, the Irish Potato Famine, the Trail of Tears, the American Revolution, the Civil War, or school desegregation.

Maybe (stretching this quite a bit) I have experienced some personal effects from the Cold War and/or the Vietnam War due to my parents' participation in them, but calling myself a "survivor" seems more like stolen valor than empathy and solidarity.