"Your umbrella is purple."
Translation:Il tuo ombrello è viola.
I read a helpful tip in another comment thread: Colors that are named after flowers do not change gender and do not have a plural form, such as "rosa" (a rose) and "viola" (a violet). And the only color that does not change gender but it unfortunately also not named after a flower is "azzuro"!
always, except for close family singular. so: your mother - tua madre, your father - tuo padre, your cousin - tuo nipote/cugino. (nipote = son or daughter of you brother/sister and cugino/a = sun or daughter of you uncle or aunt. Nipote is also grandson or granddaughter) BUT: plural needs an article. so: your sisters - le tue sorelle, your brothers - i tuoi fratelli. etc.