Option to have only blood relationships in "Set relationship"

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The direct line has no issues, but the cousins have. An example is shown here in 3rd answer:

An update on RM10's improved Set Relationships feature

I am speculating that we will seem some tweaks in the future and maybe the changes in 10.0.1 will lead us to more fine tuning of what a use wants or does not want to see. It seems that 10.0.1 is working as designed but not necessarily as desired for everyone.