and his mother
Being idiomatic, the phrase can take a number of forms. Versions that replace his with their are common, and in this case mother can be in the singular or plural. and her mother is also attested, used when emphasising that a group is mostly or entirely female. Regional and dialectal synonyms for mother such as mom, mum, mam, momma, mama and ma are also commonly substituted. See the citations page for examples .