kinship traced through the mother's family is called what kind of descent
Matrilineality Matrilineality is the tracing of descent through the female line. It may also correlate with a societal system in which each person is identified with their matriline – their mother's lineage – and which can involve the inheritance of property and/or titles. A matriline is a line of descent from a female ancestor to a descendant (of either sex) in which the individuals in all intervening generations are mothers – in other words, a "mother line". In a matrilineal descent system, an individual is considered to belong to the same descent group as her or his mother. This matrilineal descent pattern is in contrast to the more common pattern of patrilineal descent from which a family name is usually derived. The matriline of historical nobility was also called her or his enatic or uterine ancestry, corresponding to the patrilineal or "agnatic" ancestry.
Stepfamily The earliest recorded use of the prefix step-, in the form steop-, is from an 8th-century glossary of Latin-Old English words meaning "orphan". Steopsunu is given for the Latin word filiaster and steopmoder for nouerca. Similar words recorded later in Old English include stepbairn, stepchild and stepfather. The words are used to denote a connection resulting from the remarriage of a widowed parent and are related to the word ástíeped meaning bereaved, with stepbairn and stepchild occasionally used simply as synonyms for orphan. Words such as stepbrother, stepniece and stepparent appeared much later and do not have any particular connotation of bereavement. Corresponding words in other Germanic languages include: Old High German stiuf- and Old Norse stjúp-.[6]