The daughter isotope will be shown above the parent isotope in graph.
Explanation:
A daughter isotope remains after the original isotopes have undergone radioactive decay. The daughter nuclide is a decay product.
The 1 :3 half-life of the daughter isotopes remain. The daughter isotope is more stable than the parent isotope and if the parent isotope has a half-life of 0.5 then two half-lives of remaining are 0.25 and thus 0.75 half-lives of daughter isotope.
