La familia – The Family
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Keep in mind that masculine plurals in Spanish can refer to mixed groups of males and females.
Thus cuatro hijos can mean either "four sons" or "four children," depending on the context.
In addition, while it may sound strange to the ear attuned to English, padres is a grammatically
correct way to refer to both of one's parents.
Also, note that the word pariente means "relative" in general; it does not refer only to parents.
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Here are the words for the most common relatives and some of the uncommon ones:
padre:
father
padrastro:
stepfather
madre:
mother
madrastra:
stepmother
hermano:
brother
hijastro:
stepson
hermana:
sister
hijastra:
stepdaughter
suegro:
father-in-law
hermanastro:
stepbrother
suegra:
mother-in-law
hermanastra:
stepsister
cuñado:
brother-in-law
medio hermano:
half brother
cuñada:
sister-in-law
media hermana:
half sister
esposo, marido:
husband
prometido, novio:
fiancé, boyfriend, groom
esposa, mujer:
wife
prometida, novia:
fiancé, girlfriend, bride
abuelo:
grandfather
padrino:
godfather
abuela:
grandmother
madrina:
godmother
bisabuelo:
great-grandfather
soltero:
single man
bisabuela:
great-grandmother
soltera:
single woman
tatarabuelo:
great-great-grandfather
casado:
married man
tatarabuela:
great-great-grandmother
casada:
married woman
hijo:
son
yerno:
son-in-law
hija:
daughter
nuera:
daugther-in-law
nieto:
grandson
nieta:
granddaughter
tío:
uncle
tía:
aunt
tío abuelo:
great-uncle
tía abuela:
great-aunt
primo:
cousin (male)
prima:
cousin (female)
sobrino:
nephew
sobrina:
niece