I have had a very long search for this family in the 1861 census - cannot find any member of the family. Most infuriating !

When Mary Ann married in May 1866, she was only about 17yrs, yet she says she was full age. Husband, Henry was 19 but also said he was full age perhaps they were married without parents knowledge, and so they lied about age. Or her parents were not alive anymore?
Her address was Kent St, Southwark. Same as Henry. When did she move to this area in Surrey?
I think you might need to have a look at this marriage certificate and / or birth cert of one of the boys to see if that helps sort out the issue.
That marriage for Mary Ann Wright to John Jeffery in Lutterworth is 1st quarter 1848.