I had a DFIL, dear father in law, whom I loved very much and will always think of him and miss him. I also had a NSDMIL, not so dear mother in law, who, when she died at age age 87, caused celebration for me and my DDs (dear daughters). DH,dear husband, had mixed feelings and he found it convenient to forget the many times she was an interfering witch and hurt the DDs.
So much for acronyms.