Please see 1851 Census first, so you’ll better understand the following:-

1841 Census John/Jonas Crabtree’s mother is Grace Crabtree/Greenwood. The house address is the same as in 1851 as well as mother and fathers names. John/Jonas in the 1851 Census really is Abraham Greenwood’s step son and the son of Grace Greenwood.

Address: Mark Lane Stansfield

1. Abraham Greenwood, head, age 60. born 1781, Yorkshire,Stansfield. Cotton Weaver,
2. Grace Greenwood, wife, 40, born 1801, Yorkshire Stansfield (Doris’s G,G, Grandmother)
3. William Greenwood, 14, born 1827 Cotton power loom weaver
4. Anderson Greenwood, 12, born 1829, Yorkshire, Stansfield
5. Sarah Greenwood, 5, born 1836, Yorkshire, Stansfield
6. John/Jonas Crabtree, 20, Cotton Power Loom weaver, born Stansfield (this will be Jonas) (Doris’s Great-Grandfather)
7. Josiah Crabtree, 15, Cotton power loom weaver, born Stansfield