sibs, sister, brother, cousin, offspring, parent, fraternal twin, firstborn, son, playmate, twins, daughter, tyke, mother, sis, eldest, grandchild, father, stepbrother, triplet, preschooler, stepmother, grandparent, dad, child, stepparent, monozygotic, littermate, schoolmate, pup, nephew, mom, runt, daddy, goddaughter, identical twin, family, niece, infanthood, paternal, spouse, golden retriever, brood, aunt, uncle, neighbor, rugrat, stepsister, godparents, godson, proband, brawnier, companion, boy, cuddlesome, stepson, adoptive parent, tagalong, chubbiness, calico cat, adoptee, pug, toddler, sextuplet, bambino, bedmate, mentee, filial, bratty, classmate, poppa, moppet, stepmom, grandson, infant, mommy, stepfather, cairn terrier, cockapoo, puppy, sprog, kitten, kindergartener, monozygotic twin, grownup, auntie, guardian, cocker, aunty, friend, rival, progeny, towhead, mum, pals, baby, competitor, dyads, oldster, kindergartner, tot, hubby, siblings, sib, brothers, granddaughter, twin, children, grandchildren, member, relatives, intergenerational, group, intrafamilial, affinal, interindividual, interspecific, intragroup, parentchild, agnatic, generational, consanguineal, dyadic, interethnic, intergroup, interinstitutional

half blood, quad, quadruplet, quin, quint, quintuplet

male sibling

relation, relative