junior
younger
subteen
two
twos
second cousin once removed
nibbling
knee baby
younghead
titch
bovver bird
twinsie
twinling
half-cousin
mersister
teenager
feely
half
coeval
contemporary
pigeon pair
ephebe
our kid
rug monkey
rugrat
halfling
cotwin
male sibling
second cousin
sylphid
age-mate
lanneret
pretween
half blood
tacker
adult third culture kid
first cousin once removed
preteen
feely-omi
sister
juvenile
second grader
first cousin twice removed
grandchild
brother german
nonidentical
three
elder
half niece
half-first cousin
paternal cousin
fraternal
youngest
baby of the family
maternal cousin
half-uncle
catworm
youthman
lastborn
irregular double first cousin
tweenie
sesquiple first cousin
uterine sibling
little boy
shaver
littlie
birthmate
duo
little brother
little sister
third cousin
peanut
cousinette
big brother
kipper
loon