Alternative spelling of three-quarter sibling

(horse breeding) The offspring of a horse's sire/dam that is by/out of a sibling of its other parent. / (horse breeding) The offspring of a horse's dam and a son of its sire.

The half sibling of one's spouse. / The spouse of one's half sibling. / The spouse of the half sibling of one's spouse.

Used to ask how many brothers or sisters someone has.

plural of siblingship

The role or position of sibling.