1841 census has this:
Reference HO107, Piece 684, Book/Folio 10/16, Page 26
St Pancras, Marylebone, Middlesex
Lander, James M 35 Carpenter N
Lander, Sarah F 65 N
Lander, Hannah F 25 Y
Lander, Henry M 14 Y
Lander, Sarah F 10 N
Lander, Robert M 8 N
Lander, Isabella F 6 N
Lander, John M 15 months Y
(Y/N refers to the question Born in County?)
Ages were rounded down to a multiple of 5 years.
I would hazard a guess that Sarah is the mother of James?
1851 census: Reference HO107, 1496, 244, 46
39 Crescent Street, Somers Town, St Pancras
Lander, James Head M 49 Carpenter b Cornwall
Lander, Harriet Wife F 35 b Hoxton
Lander, John Son M 11 b St Pancras
Lander, Eliza Daughter F 5 b St Pancras
Lander, James Son M 9 b St Pancras