I didn't know the term "in law" could also mean "step" in past times ! You learn something new every day
Appart from the Familysearch.org website, I have searched the M.I's for Woolwich, Lewisham and Deptford Churchyards in an attempt to find Jeremiah MILLER Jnr . I have yet to take a look at the Parish registers.
I have made a note of all the CLIBBON family details you so kindly supplied and think you may have something in that Mary Ann MILLER could have remarried. If so, she didn't waste much time, after only 2 1/2 years ! Morden Street in Greenwich is very close to where the MILLER family were living in 1811. It was in the Limekilns area now Greenwich South Street/Lewisham Road.