If the sun is a second or third generation star, where is the neutron star?
Stars are not like animals, with well-defined parents. They form from interstellar gas clouds that in turn originate from stellar winds and supernova ejecta from other stars in a mixture with primordial gas. It is unlikely that the sun is &quot;descended&quot; to a great degree from any particular past star.
(Even if it had been, the sun formed about 18 galactic rotations ago and we are nowhere near the bodies in that past neighbourhood now, due to mixing)