What to do when aunt defames one on charges of stealing jewellery?

In 1990 I settled down in Bangalore from Kolkata. In 1998 I called my parents to Bangalore as they were old. All valuables and jewellery my mother handed to her sister in Kolkata for safety for her future old age.all of our family knows.in 2013 my mother asked the belongings from her sister.she informed to my mother that she has returned back to me but she has not.her intention is to cheat my mother as my father also died in 2002.now my mother is quarelling with me and my wife.my aunt is spreading to all that I have stolen my mother belonging and all my respect is gone among my relative.my mother is also believing her sister..my mother told my wife that she will put her in jail with some false allegation .my mother now went to Kolkata and staying alone. What I want that my aunt should give my mother back her belonging so she stay happily in old age.for my prestige and wrongdoing I I want to teach my aunt a lesson so that she doesn't spoil my name and fame in society and family.pls