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Thanks Milliepede.  Birth cert is an option, but I'm reluctant to bother the GRO in current circumstances.  You have the right family, though the index does not include mother's maiden name for this period.  The 1911 census says they had 4 children, 2 alive (Charles Henry and Frances Maud, who appear in other censuses and records), and 2 deceased, one of whom was Mary Ann (1891-94), born and died Middlesbrough, where they lived later.  This Georgina appears to be the only one that does not belong elsewhere.  If right I suspect stillborn.  Still, as with Frederick, it's worth seeing if someone can help.
Best wishes, Dion.

Thanks Rosie and Christine.  The maiden name was Perkins, but that seems academic, now.  Looks like 21 years it is, so Frederick belongs elsewhere - could be his mother was unmarried and the name hints at the father being Stevenson.  Best wishes, Dion.
PS there is another iron in this fire and I will start a new topic.

Sorry I picked this up a bit late, but I have done quite a lot of research on the Dennis families in Derbyshire & Leicestershire, and I think I can tidy up a bit.  We know that Mary Anne Dennis or Dennies was not with family for the 1841 census.  From that I infer that she moved, married or died.  The burial notably at Castle Gresley 6 Feb 1838 age 16 fits - if baptism 1 Apr 1821 would likely still be 16 going on 17.  The Entry of Death might reveal that the informant was related.

The family in 1841 that jimnix found is that of John and Ann Rushton.

Her father John Dennis (m. Ann Rushton) his grandfather (also John) was brother of Henry Dennis b. 1718.

Also, Mary Anne's father was in the censuses respectively 1841 labourer, 1851 Ag Lab, 1861 Ag Laborer.  I believe he died in 1864 at Barton under Needwood, where he had lived with oldest daughter Elizabeth.

To be honest, trying to find a specific Mary Dennis is like looking for a needle in a haystack.

My tree on Ancestry is BrownCarterDennisEvans.

Best wishes
Andy Dennis.

Thank you so much!  That really is helpful.
Dion