according to lee family tree vol2. by terence lee, it states;
children for justina deighton 1824 & zachariah (alias levi in 1851 census) boswell are;
levi 1847, married urania lee, herbert percy bap 26/05/1850, emily bap 30/07/1856, john neverfess bap 22/05/1859 m; a joanna and had abraham & percy, , esther bap 02/03/1862, and annie b;1866, m;06/06/1916 plumstead.
he does not mention kate in this tree, but that may not mean anything as she obviously exists if she's in 1861 census
justina deightons parents were james 1804 and eliza ?
zachariah's parents were abel boswell & lucy scamp.
as i said this is from the lee family tree and not my own findings i hope it helps.
also there is a site called romany genes ( i believe) and it has great census infomation with boswells on as well as other families travelling & stopping at same spots.
amanda