Mother tongue of married spouse or common-law partner (10), mother tongue of child (10), mother tongue of other married spouse or common-law partner (10), knowledge of official languages by married spouse or common-law partner (5), knowledge of official languages by child (5), knowledge of official languages by other married spouse or common-law partner (5) and age group of child (5) for children under 18 years of age in couple families in private households, Census, 2011