MissAdventure
The posts I find most difficult to decipher are the DD, DDIL, DGD, DDOG, DGDOG, SIL, the other SIL, and DUncle Tom Cobbly and all.
I puzzled over DDOG but I suppose I get what is meant.
Maybe SiLM and SiLF would disambiguate effectively.
Or DSiM and DSiLF
What about DMiL too.
Or even AJ or DAJ 
Would you like
a cup of tea,
a piece of cake
and a talk with me?
And when we've talked
it should be clear
how you will now
address me, dear.
You won't call me Mum
you've let it be known
for you've got a Mum
of your own.
By my first name
As friends and husband do
I gladly give
that choice to you.
Though as you're married
to my son
I respect your view
it isn't done.
So to me my dear
the solution is plain
you may address me
as Auntie Jane