Purpose: For Family Relationship, the values are always in reference to the proband, but we aren't currently marking the proband in any way. Perhaps the absence of a family relationship is sufficient, but it seems better to be explicit
Who it benefits: Anyone who has family relationships as part of their data
Use case: For a dataset with extended family, there may be quite a few individuals which would make it a bit messier to identify the actual proband. Having a way to clearly identify which individual is a proband would could be very helpful.
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