x1 is a biological/genetic-familial/'blood' aunt/uncle of x2 by genetic-familial bond/tie/blood relation x3; x1 is a genetically and familially associated member of x2's genetic/biological parent(s)'s generation.
No prefix "great-"s or "grand-"s may immediately precede this word in English translation. A ginlazytunba of x1 must be a ginlazrirni of x2.