“should the families of Union soldiers who died during the Civil War receive reparations as well?”
They did, in the form of pensions paid to the veterans, their widows and children. At least one such pension was still being paid as of mid 2020 to the surviving child of a Union Army veteran.
Yep.
Irene Triplett died around June 2020, age 90. Her father was in his 80s when she was born.