I call DH's parents by their first names. DH calls my parents by their first names unless hes being silly with mum then he calls her "mum". Same when he is referring to them - as in "mum came over today" meaning my mum as his parents dont call over.
My mum calls her inlaws (so my grandparents) Mother and Father but they all do. Both their sons and thier daughter in laws. Its just always happened. But dad calls his Inlaws by their first names
Nothing. Nothing from the day I met her. She never introduced herself, just made it known she knew who I was (she came into my work). When we broached the subject of what I should call her year's later, she told me I was to call her "DH's Mother" (obviously DH's real name). As both DH and I found that utterly ridiculous, I continued to call her nothing. Now there is no issue anymore, because we don't see her.
By their first names and DH does the same with my parents. I think even if we were super close it would be weird calling MIL 'mum' as she's just not my mum, but each to their own.
On a side note, I was getting really irritated when she constantly signed off as 'mum and dad' in my birthday cards, etc, so I made sure I addresed them as both mum & dad (from DH) AND by their first names (from me) in any cards I sent them. She soon got the hint.
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