Help me piece Nellie Pagett into the family...

[Dundee]

There was an older boy but he died as a child, so Fanny was the eldest surviving.

As an aside, the first child you have is James who was born in 1857 which is still a long time after marriage.  These three births are also likely to be theirs and have possible corresponding deaths.

PAGETT, WALTER
Mother's maiden surname: TOWNSEND     
GRO Reference: 1854  S Quarter in BIRMINGHAM  Volume 06D  Page 69

PAGETT, WILLIAM  HENRY
Mother's maiden surname: TOWNSEND     
GRO Reference: 1855  S Quarter in BIRMINGHAM  Volume 06D  Page 81

PAGETT, KATE
Mother's maiden surname: TOWNSEND
GRO Reference: 1869  S Quarter in BIRMINGHAM  Volume 06D  Page 87

Debra 

[Autumn9]

I did see a few other Townsend/Pagett births, but haven’t managed to locate baptism records to confirm parents like I have for the other children so I haven’t added them to the tree until I’m 100%. Off the top of my head I think there are 3-4 other children. Possibly those named above and possibly an Arthur also.

[Milliepede]

I wondered if there had been an older daughter who could have been Nellie's mother but without a birth certificate or baptism to investigate none the wiser. 

Has anyone found her in 1939 to get her date of birth?