While the details here are thin, it appears what you are asking is this:
1) there is a household member currently under indictment for a felony, and the there is a requirement that any guns in the household be secured to prevent their access by that person.
2) this is a condition of parole or something since you said "charged" and not convicted.
Considering that, let's go through it logically. If something were to happen that landed this in court, say the accused felon took a gun and was arrested again, or if a parole officer visited and saw the cabinet, then you'd be on the line to answer for that and have to be judged. I don't think any reasonable judge is going to "consider anything you can break into with a soup spoon as secure." So I really think PlayboyPenguin is correct.
"Secure" has a much more specific meaning - it shouldn't be able to just be casually smashed open. This doesn't mean you need to go drop a grand on a monster safe - trigger locks, or a snake-like cable that goes through all the actions, etc. should suffice, and the keys kept secured elsewhere. This would be a low-cost way to solve the problem. Around here, most local PDs give away trigger/action locks for free, so maybe yours does, too.