I believe Ashton Gate stadium is owned by Bristol City Holdings Ltd which, along with the various other companies in the group, is ultimately owned by Steve and Maggie via Pula Sport Limited. No problemo.
I think most clubs have restructured in this sort of way in modern times. Which is very different from, say, a Coventry City situation where they sold their stadium and then rented a new one from a third party, which was absolutely ruinous for them.