While there may be a way to edit it, I think I'd be inclined to call Local Unit Support. The reason is, that child's records must have "parents", but it's not linked to the real parents. If we were talking about a non-member child, this would be simple. But since the child is a member there's a number of links that are broken. Only some of which are under your control. It would be best to get the whole thing done right rather an a piecemeal fashion that has to be fixed by someone else.
Have you searched the
Help Center? Try doing a Google search and adding "site:churchofjesuschrist.org/help" to the search criteria.
So we can better help you, please edit your
Profile to include your general location.