children should only be attached to parents or step-parents, or adopted parents etc.
you could also add a note with your info and the nieces PID for reference.
You certain CAN add your "Niece"; as in a, "Parent-Child" Relationship", to the "Aunt" and "Uncle", with whom she is living, just make the "Relationship Type" as "Guardianship" - plus, add a comprehensive "Reason Statement" as to the circumstances
This is done in just the SAME way as adding any Child to a Family/Couple. Just make sure that you make the "Relationship Type" as "Guardianship".
Of course, if or when, you locate her actual (Biological) Parents, you should add them, with the "Relationship Type" as "Biological".
You can certainly STILL leave the existing "Parent-Child" Relationship" (ie. Guardianship), to the "Aunt" and "Uncle", as is.
No need to 'whitewash' history/fact.
Here are some "Knowledge Articles" in "FamilySearch":
How do I specify biological, step, adopted, and foster relationships in Family Tree?
The same child shows more than once in a family in Family Tree
I hope this helps.
Yes "Guardian ship" is another option - similar to "step parent"
but do you really know they were "guardians"
or you are just going on the fact that on some census record she appears in the same household as the grandparents
which could merely mean she was at the house when the census taker came by?
and no need for "white washing" at all.
@Family Bible & @Dennis J Yancey
I do not try to read too much into a 'Question', I try not to 'second guess' ...
'John' simply stated that he "... has a niece living with an aunt and uncle but have not found her parents. ...".
I was not trying to extrapolate as to the WHY she was "... living with an aunt and uncle ..."; as, there can be many reasons (one of which you suggest).
I have know of Children that are "Living" with Family members other than their (Biological) Parents, in fact, there are many such in "Family Tree" of "FamilySearch".
'John' simply asked, "...Is there a way to attach her to the Uncle? ...", I just gave him a SIMPLE option, that can be EXTENDED upon, if; and, when, required.
Many new/inexperienced Users/Patrons find Children "living" (associated) with with Family members other than their (Biological) Parents (especially, in Census records); and, DO NOT know how to deal with them.
I was just giving 'John' an option to record his "Niece" in "Family Tree" pf "FamilySearch", in the FIRST instance, so she is not lost or left out, UNTIL he finds her Parents.
Which I am certain he is actively doing.
And, currently, as there are ONLY Five (5) types of "Relationship Types" for "Parent-Child" Relationships in "Family Tree" of "FamilySearch":
I would suggest that the latter, "Guardianship", would be the BEST of those "Relationship Types" in 'John's' case; certainly, NOT "Step".
But, that is just me ...
The choice is up to 'John'.
Thanks everybody! Here is some detail...more than you want. I was looking at census records (1930) that listed an uncle of mine. As I scrolled down the page, I came across another family with the same last name. What peeked my interested is my uncle and his family were listed as "white" and the other family were listed as "negro". Both adult men worked at the same paper mill (it is a small town). The niece of the African-American family was old enough (23) to be listed on her own but she was listed as "niece" ... I guess they couldn't have two heads of household at th same address? Based on Brett's advice, I have listed her as "guardianship" FOR NOW. I'm looking for siblings and parents now but the records for African-American's can be a bit murky. Thanks again (if I fail to find family members for her, I'll delete her but I don't plan on giving up anytime soon,)
As a side note: A "head of household" wasn't the same as "adult" i.e., every adult who was working and not necessarily a dependent would not have been a head of household. Usually the head either owned the house or was the main "breadwinner" paying the rent/expenses.
I have seen two heads of households at one address, but usually these involve separate families who are sharing the house.