family: descendant
genos denotes a lineage or people defined by descent, and in some contexts a kind or class of things.
The dominant usage marks descent, family, ethnic identity, or a people-group, whether identifying individuals by ancestry or speaking of offspring and descendants. A smaller cluster uses the plural for kinds or classes, including tongues and voices, and a singular instance identifies a particular kind that cannot be expelled except by prayer.
Senses in use
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Lineage, descent, or people-group · dominant
In Acts 13:26 the genitive singular occurs in the address to those identified with Abraham’s family, while Acts 18:24 uses the dative singular in identifying Apollos by descent. In Acts 17:28 and Acts 17:29, the nominative singular frames people as God’s offspring; Revelation 22:16 similarly includes David’s descendant in Jesus’ self-description.
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Kinds or classes · occasional
The nominative and accusative plural forms occur among varieties of tongues in 1 Corinthians 12:10 and 1 Corinthians 12:28, and 1 Corinthians 14:10 speaks of many kinds of voices in the world. In Mark 9:29, the nominative singular identifies a particular kind in the statement that it cannot come out except by prayer.
In the Anselm Project Bible: Across these verses, the APB presents the relevant clauses with expressions such as “family,” “offspring,” “by descent,” “descendant,” and “kinds.” Because it is a whole-verse translation, these expressions show the clauses’ presentation rather than fixed English equivalents.