half-brother 25% sister / brother 50% grandmother / grandfather / granddaughter / grandson 25% half-aunt / half-uncle / half-niece / half-nephew 12.5% aunt / uncle / niece / nephew 25% half-first-cousin 6.25% first-cousin 12.5% irregular-double-first-cousin 18.75% double-first-cousin 25% great-grandmother / great-grandfather / great-granddaughter / 12.5% great-grandson half-grandaunt / half-granduncle / half-grandniece / 6.25% great-grandnephew half-first-cousin-twice-removed 1.5625% first-cousin-twice-removed 3.125% irregular-double-first-cousin-twice-removed 4.6875% double-first-cousin-twice-removed 6.25% half-second-cousin-once-removed 0.78125% second-cousin-once-removed 1.5625% irregular-double-second-cousin-once-removed 2.34375% double-second-cousin-once-removed 3.125% irregular-triple-second-cousin-once-removed 3.90625% triple-second-cousin-once-removed 4.6875% irregular-quadruple-second-cousin-once-removed 5.46875% quadruple-second-cousin-once-removed 6.25% half-third-cousin 0.390625% third-cousin 0.78125% irregular-double-third-cousin 1.171875% double-third-cousin 1.5625% irregular-triple-third-cousin 1.953125% triple-third-cousin 2.34375% irregular-quadruple-third-cousin 2.734375% quadruple-third-cousin 3.125% irregular-quintuple-third-cousin 3.515625% quintuple-third-cousin 3.90625% irregular-sextuple-third-cousin 4.296875% sextuple-third-cousin 4.6875% irregular-septuple-third-cousin 5.078125% septuple-third-cousin 5.46875% irregular-octuple-third-cousin 5.859375% octuple-third-cousin 6.25% great-great-great-grandmother / great-great-great-grandfather / 3.125% half-great-grandniece / half-great-grandnephew great-grandaunt / great-granduncle / great-grandniece / 6.25% great-great-granddaughter / great-great-grandson half-great-grandaunt / half-great-granduncle / 3.125% half-great-grandniece / half-great-grandnephew great-grandaunt / great-granduncle /