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Second-degree relative

someone who shares 25% of a person's genes: uncles, aunts, nephews, nieces, grandparents, grandchildren, half-siblings, and double cousins

Pronunciation
/sɪˈkɒnd - dɪˈɡriː ˈrɛlətɪv/
/ˈsɛkənd - dəˈɡri ˈrɛlədɪv/