Additionally , Bart is the first cousin of XS , a Legionnaire and daughter of Dawn Allen .
His paternal grandmother , Iris West Allen , is also the adoptive aunt of the first Kid Flash , Wally West ( Bart 's first cousin once removed ) .
Bart is the first Bart of XS , a Legionnaire and daughter of Dawn Allen .
His paternal grandmother , Iris West Allen , is also the adoptive aunt of the first Kid Flash , Wally West ( Bart 's first cousin once removed ) .