1)
My grandma has got nice flovers
My grandma`s flowers are nice.
2)
My mum has a red hat
My mum's hat is red
3)
My dad has got a very good computer game
My dad's computer game is good.
4)
My grandpa has got a big bike
My grandpa's bike is big.
5)
Rexhas got a funny teddy bear
Rex's teddy bear is funny.