ро́дственный — meaning in English

rodstvennyy

English meaning

akin adj Similar in nature, quality, or character; comparable.
cognate adj Connected by blood or birth; in law, specifically related through the mother's side.
congenial adj Pleasant and easy to get along with; friendly.
connate adj Sharing the same origin or nature as something else.
kindred noun One's relatives, taken collectively; family connections.
related adj Connected in some way to something else.

ро́дственный is used for these senses in English:

akin (often, followed by to) Allied by nature; similar; partaking of the same properties; of the same kind.
cognate (linguistics) Descended from the same source lexemes (same etymons) of an ancestor language.
congenial Having the same or very similar nature, personality, tastes, habits or interests.
connate Of the same or a similar nature; proceeding from the same stock or root.
consanguineous Related by birth; descended from the same parent or ancestor.
kindred Of the same nature, or of similar character.
related Being a relative of.
relational (art) Dealing with the whole of human relations and their social context, rather than an independent and private space.

adj Connected by blood or birth; in law, specifically related through the mother's side.
adj Sharing a common nature or origin with something else.
adj (linguistics) Coming from the same original word in an earlier language.