Can the POV keep a sibling banned from the rented property where mom stays?

More information would be needed, as Katiekate mentioned. If you are asking about a Power of Attorney, it goes back to the kind of POA (health versus financial) and the actual language in the POA itself, versus the actual situation you are dealing with.

POV? Do you mean POA. Power of attorney?

Does that also include medical power of attorney...or just financial?

Need a lot more background info to be able to answer this.