For this, you can use the ‘ours’ merge strategy
Just go through the following commands that will help you to make current git branch to another branch
git checkout better_branch # checkout to the branch
git merge --strategy=ours --no-commit master #keep the content of this branch, record a merge
But in this case you could do:
git checkout staging
git merge -s ours email # Merge branches, but use our branch head
This will help you to dump all the contents of staging into email.