going by children in those last two censuses these look possible births for Jane and Martha SMITH
But I can't find one yet in Yorkshire for Thomas, nor can I see a Joseph Smith/ Margaret Usherwood marriage
SMITH, MARTHA USHERWOOD Order
GRO Reference: 1846 D Quarter in WEST DERBY Volume 20 Page 992 Order
SMITH, JANE USHERWOOD Order
GRO Reference: 1843 J Quarter in WEST DERBY Volume 20 Page 903 Order