So, the only reference to Sherlock and Mycroft's mum in the BBC series is
Mycroft: And you know how it always upset Mummy
Sherlock: I upset her? Me? It wasn't me that upset her, Mycroft
John: N-no wait. Mummy? Who's Mummy?
Sherlock: Mother. Our Mother. This is my brother, Mycroft.
To me, that sounds clearly past tense. It could be short for "
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