That depends on HOW and WHERE the incorrect link/connection is in your "Ancestral" lines in "Family Tree" of 'FamilySearch'; as, technically, we DO NOT a 'Tree' in "Family Tree" of 'FamilySearch' ...
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'.
That said ..
You can "Detach" (ie. "Remove" or "Replace") the 'wayward' "Branch", it just depends on whether it is, an Individual/Person; or, a "Couple" ...
For starters, here are a couple of "Knowledge Articles" in 'FamilySearch'
A person in Family Tree has the wrong spouse
How do I correct parent-child relationships in Family Tree?
I hope this helps.
Thanks for the info will try later