When's your birthday?
It's in ... / It's on ...
T/F: Christmas is on December.
F-> Christmas is in December.
T/F: When is your birthday?
T
When's your father's birthday?
It's in ... / It's on ...
T/F: My birthday is on July.
F-> My birthday is in July.
When's your mother's birthday?
It's in ... / It's on ...