When a two tests are on the same sample, they are referred to as sibling tests since they are at the same level in the hierarchy. While the word sibling could also refer to samples or work orders, it's not often done as these don't share data in the same way as sibling tests sometimes do.
This is most applicable to aggregate, soil and asphalt tests. When two tests are added to the same sample in QESTLab, this indicates that the tests are carried out on "the same" material. This might be two different representative samples from a bulk (large) sample or might actually be the very same material (this depends on the effect of the test on the material and whether the test changes the material properties such that it is no longer representative).
Where a result is imported into a worksheet, this often comes from sibling tests.
