This is my parents.parents加s对吗?

this is my( ).these are my parents and this is Whose book is this,It’s _.My parents bought it for my sister This is my grandfather.He is my (parents') father.对不对 ?! There are my parents对吗 1.（ ）are my parents and this is my sister 这是我的父母是还是This is my parents?还是These are my parents? My ( ) is my grandparents.A选择:parent's parents B选择:parents' My parents'?is my sister? My parents like like后面加s吗? this is my ( )and this is my( ).they are my parents My ( )hobby is drawing.填parent's还是parents'? My parents's favourite sport is running.的问句是什么?