Hi Jomot,
Where did you obtain all of your information, I have looked on findmypast and found the two marriages but not all the in depth info you have. Are you by chance related to this line? The idea that Julia could have been Elizabeth`s mother is possible,she could have been born before the marriage to William Meadows, so hence the use of Meadows Sparks. Elizabeth had Emma out of wedlock so again she could have used the same surnames again. It is only on Emma`s wedding certificate that she uses the Meadow Sparks surname and then names her father as being James Gray. Family history is certainly full of fun, I was just looking at a census return for Julia, it says that she is `on a mission at sea`. I wonder what she was upto?
I look forward to hearing from you soon,
Regards,
Jackie.