Granduncle's relatives

Great-uncle's wife: Grandmother/Grandmother (father's aunt).

Uncle's son and daughter-in-law: uncle and aunt.

Granduncle's daughter and son-in-law: granduncle and aunt.

Grandson/daughter of great-uncle: brother and sister of great-uncle.

Grandson/daughter of granduncle: Cousin. Great-uncle's wife: great-aunt/great-aunt (mother's aunt).

Granduncle's son and daughter-in-law: uncle and aunt.

Uncle's daughter and son-in-law: uncle and aunt.

Granduncle's grandson/daughter: Cousins.

Grandson/daughter of uncle/grandfather: Cousins. Great-uncle's wife: great-aunt (husband's aunt).

My uncle's son and daughter-in-law (older than my husband): my uncle and sister-in-law. (Auntie)

My uncle's son and daughter-in-law (younger than my husband): my uncle and sister-in-law. (Auntie)

Daughter and son-in-law of uncle (older than husband): aunt, brother-in-law. (Uncle)

My uncle's daughter-in-law (younger than my husband): my uncle's sister-in-law, my uncle's brother-in-law. (brother-in-law)

Uncle's grandson/daughter: uncle, cousin, nephew, male/female niece.

Uncle's grandson/daughter: uncle's niece/niece.