Do we have the same DNA as your siblings?

Unless they're an identical twin, no... or at least, it's EXTREMELY unlikely. If you're female, your DNA should be 50% similar to a sister; if your sibling is of the opposite sex, your DNA will average slightly less than 50% similar (a fraction of roughly 22/46); and if you're male, your DNA will average slightly more than 50% similar to a brother (24/46) because the Y chromosome is inherited exclusively through the father.