Can I get back something I temporarily gave to family member

Of course you can "ask for it back", but whether you can have a court compel her to return it depends on what the deal was originally.  If the Court finds that you are telling the truth, and you were only lending the furniture to your sister for a period of time which time has passes, you cna get the furnityre back.  If the court finds (as your sister may claim) that it was an unconditional gift, you can't revoke it.