Short answer: French family words come in masculine and feminine pairs (le frère, la sœur), and “my” changes to match: mon père, ma mère, mes parents. Two traps: les parents also means “relatives”, and beau-père means both stepfather and father-in-law.
Possessives
Mon, ma, mes, and the vowel exception
A possessive shows who something belongs to. In French it matches the person owned, not the owner: son père is “his father” or “her father”. Before a vowel sound, ma becomes mon to keep the sounds apart: mon amie (my female friend), never ma amie.
le words
la words
la + vowel
plural
my
your (tu)
his / her
In-laws and step-family
Beau-père: one word, two relatives
French uses beau- and belle- (literally “handsome”, “beautiful”) for both in-laws and step-relatives. The context tells you which.
A trap
Les parents: parents or relatives?
One word, two meanings. The small word in front of parents tells you which one is meant.
= mother and fatheryour two parents
Clue words
mestessesnos
Mesmyparentsparentssontaredivorcés.divorced
may pa-RAH(N) soh(n) dee-vor-SAY“My parents are divorced.”Why:A possessive plus a couple-type context: mother and father.
JeIvislivechezatmesmyparents.parents
zhuh vee shay may pa-RAH(N)“I live with my parents.”Why:Chez mes parents is the family home: your mum and dad.