lastborn

noun 0.803

firstborn

noun 0.702

little brother

noun 0.659

baby of the family

noun 0.649

youngest

noun 0.647

second banana

noun 0.646

younger

noun 0.626

kid brother

noun 0.607

little sister

noun 0.601

second fiddle

noun 0.598

younger sister

noun 0.595

eldest

noun 0.595

number two

noun 0.589

sibling

noun 0.586

second string

noun 0.584

half brother

noun 0.582

firstling

noun 0.571

middle name

noun 0.570

middle pair

noun 0.569

underboss

noun 0.560

secondary

noun 0.557

second

noun 0.556

newborn

noun 0.554

third best

noun 0.552

sophomore

noun 0.552

junior

noun 0.548

stillborn

noun 0.547

secundo

noun 0.546

kid sister

noun 0.546

second violinist

noun 0.545

only child

noun 0.544

offspring

noun 0.543

twin

noun 0.542

descendant

noun 0.540

natural son

noun 0.538

single child

noun 0.536

underclassman

noun 0.535

subsequent

noun 0.533

half sister

noun 0.528

successor

noun 0.527

second grade

noun 0.524

second helping

noun 0.522

third string

noun 0.519

second hand

noun 0.519

seconde

noun 0.517

next generation

noun 0.515

unborn

noun 0.514

lower order

noun 0.514

runt of the litter

noun 0.511

afterbirth

noun 0.511

secondary work

noun 0.510

sibling rivalry

noun 0.510

understudy

noun 0.510

late bloomer

noun 0.508

junior synonym

noun 0.508

third

noun 0.508

second distance

noun 0.508

brother

noun 0.507

subordinate

noun 0.506

second cousin

noun 0.506

great-grandson

noun 0.505

youngster

noun 0.505

second sound

noun 0.504

salutatorian

noun 0.504

reborn

noun 0.503