Affidavit for gold seeking in middle of divorse case

Hai I am speaking this in behalf of my brother divorse case which is in pending past 5 years in the middle sudden her wife has given a affidavit seeking a glass statement that gold is hold with mother in law and she has given proof of photo taken wearing jewelry and audio recording of mother in law and her father discussing without mother in law awareness theyvhave recorded it and claiming mother in law accepted the gold in her custody but it's all I find it not legally valid I need experts advise in this