She is ...(we) mother
She is OUR mother
... ball is pink
ITS ball is pink
... mom is very beautiful
HER mom is very beautiful
That is ... backpack
That is HIS backpack
That is ... twin brother
That is HIS twin brother
This is ... sister
This is HER sister
Who is ... (you) sister?
Who is YOUR sister?
I don't like ... (I) shoes
I don't like MY shoes
Those are ...(they) books
Those are THEIR books