My son is almost 3 years old and he goes to my parents Monday to Wednesday nights because I have evening classes and husband works night shift.  My son is a little behind with talking.  

Both of my parents still talk to my son like he's a baby.  An example would be; he would call a dump truck "ump ump", I even told my parents what it means and they don't correct him to say the word correctly.  My father even told my son, "You can call dump truck "ump ump" because you're in my house".  

It seems useless to talk to my parents because they don't listen to me. I have told them plenty of times what it means and it's not the first time where they have not listened to me.  There was a different time with brushing his teeth.   
We were thinking of getting a babysitter but there are nights that I don't come home till 11p.m. because it's a 45 minute commute; husband works til 2 a.m.
user
Toddler son late talker, Grandparents talk to toddler like baby, and
assistant
My son is almost 3 years old and he goes to my parents Monday to Wednesday nights because I have evening classes and husband works night shift.  My son is a little behind with talking.  

Both of my parents still talk to my son like he's a baby.  An example would be; he would call a dump truck "ump ump", I even told my parents what it means and they don't correct him to say the word correctly.  My father even told my son, "You can call dump truck "ump ump" because you're in my house".  

It seems useless to talk to my parents because they don't listen to me. I have told them plenty of times what it means and it's not the first time where they have not listened to me.  There was a different time with brushing his teeth.   
We were thinking of getting a babysitter but there are nights that I don't come home till 11p.m. because it's a 45 minute commute; husband works til 2 a.m.
user
I have no idea what to do to stop my parents
assistant