It’s a valid and valuable question and for my part I actually regret grouping genetic with familial in my wording as a social family can be just as or more important than genetic family, something any of us but particularly those of us with shitty genetic family members can relate to.

That being said I think anthropology as a field can be as valuable as it can be ethical, so essentially the information from it can only be valuable if it comes from no contact or unintrusive contact. I think the toughest question is how to make that contact unintrusive though.