My parents is tall .
~> My parents are tall. 
Explanation: Take note of the subject verb agreement of your sentences.

My anut is pretty.
 ~> My aunt is pretty.
Explanation: B ecareful with the spelling of your words.
My cousin is very young. Correct!  
My grand parentsname is i don't know.
~> I don't know my grandparents' names.
Explanation: Be careful on making sentences be sure that you convey your message clearly.

Comments:

Hi, Elsa!

I wanna say great job for what you did in your homeowrk. Keep it up! I am looking forward that you will make more awesome homework next meeting see you and have a great time out there!
-Teacher Joanna