If you have "Removed" other individuals/persons, why can't you "Remove" that particular individual/person (ie. in your case, the 'Father')?
Is there a particular problem/issue?
As an aside ...
We do not have our OWN "Tree" in "Family Tree" of 'FamilySearch'.
We ONLY have "Branches" (ie, Ancestral lines), that are interconnected, in this SINGLE "One" World "Tree", for all of us, that is "Family Tree" of 'FamilySearch'.
"Family Tree" of 'FamilySearch' is NOT Other "Websites" (eg. :Ancestry_com"); and/or, 'standalone' personal programmes (eg. "Ancestral Quest:); and/or, the like.
We DO NOT have "Private"/"Personal" 'Trees' in "Family Tree" of 'FamilySearch' like Other "Websites"; and/or, 'standalone' personal programmes; and/or, the like.
We do not even, own; or, manage; and, are NOT even responsible for, the "Deceased" individuals/person in "Family Tree" of 'FamilySearch'.
"Family Tree" of 'FamilySearch' is built on a "Open Edit" Platform - hence, why any registered User/Patron can "Edit" (ie. Add, Delete; and/or, Change) ANY "Deceased" individual/person in "Family Tree" of 'FamilySearch'.
Why are you removing all relatives from "your tree"? There is NO "your tree" in the one shared FamilySearch Family tree. If you are detaching relatives from some section of the one shared tree that you think is "Your own", then you are <u>destroying data</u> that others have worked to put in there in the first place.
Have you looked at all the sources for those other records? Have you proven that they do not belong attached to the records that you removed them from? And have you provided documentation and sources that prove that their removal was justified?
It sounds like you might not be working under correct assumptions about the tree. It is different from all other sites such as Ancestry where everyone gets their one tree in their own private space. the FS FamilyTree is NOTHING like that.
If you give us the PID of the Father that you are trying to delete, someone here can actually look at it to see if you are even on the right track.