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I think Caroline is Thomas Wright's wife.  Thomas (being older than Susan) was probably already married by 1841, so the witnesses to Susan's marriage - T. Wright and Caroline Wright would be her brother and s-i-l.

Thomas Wright 24 bachelor s/o William Wright gardener married Caroline Smith 28 widow d/o Francis Saunders at Walthamstow 18 November 1840.  (transcript only - witnesses not included)

Caroline Wright in censuses gives her birthplace as Dunstable, Bedfordshire.  There is a matching baptism of Caroline Saunders d/o Francis and Martha in 1812, and a marriage at Dunstable in 1831 of Caroline Saunders to Thomas Smith.

Thank you so much . Did you find Baptist for my relative Mary Ann ? I have found Susan in 1851 census  living with mum , Ann

Not so far. 
I see that Susan Wright is with Thomas and Caroline in 1841 census.

Who did Susan Wright marry?

I have been looking for marriages of people named Wright with a father named William, who is also a gardener, as Mary Ann's father is.  So far only found Elizabeth Wright marrying George Gillott 8.11.1847 at St Leonard, Shoreditch.
Plenty of other Wrights marrying in the same general area around that time whose fathers are named William, but gardeners are thin on the ground, it seems.

The children from my 2x great-grandfather's official marriage inherited more of his DNA than the ones from his relationship to another woman (my 2x great-grandmother), which resulted i.e. in a 95cM match with a half third cousin v.s. two matches of 51cM & 42cM with two full third cousins...


. Seeing how science has already determined that the quality of a man's sperm degrades the older he gets, it makes sense that this translates to the quality slash amount of DNA he passes on to his children as well.

That can't really be the case.  Everyone inherits half their DNA from thier mother, and half from their father.  Quality doesn't affect that.

So all children of your GGgrandfather will equally have had half their genetic inheritance from him.  The difference you are seeing is in the descendents of the children from each relationship, who will have had a more random selection of GGgrandfather's genes.

 

1911 census shows William Mocock (William signed the schedule, and seems to have written this himself) aged 43 in Birmingham. He is a cycle fitter (William Morecock is a cycle hand filer in 1901),  with his son Samuel (aged 15).   
Lodging at the same address is Agnes Haywood (widow), and  two daughters: Kathleen aged 9 and Agnes aged 3 months.

William is married, and has filled in the details for years  married (21) and number of children (5: 3 still living).

There are actually 9 births of Morecock children with mother's maiden name Bradley between 1880 and 1910. There doesn't seem to be any other marriage of a couple with those surnames.

1885 Mary Ann
1887 Jane
1890 William George  - died 1896 aged 6
1892 Kate
1894 Alfred - died 1894
1896 Samuel
1898 Thomas - died 1898
1899 Ellen -died 1899
1902 George William