This - That - These - Those

One day in the park... Me and my friend Francisco talk about...

Alex: Hello Francisco! How are you?
Francisco: Hi Alex. I´m very fine thanks.
Alex: Is that your house?
Francisco: No it isn´t. It´s that one
Alex: wow it´s very nice and big!
Francisco: And those are my grandparents´s houses.
Alex: I like it! Lets go to the park.
Francisco:Sure.
Alex: Let's take seat in these bankings
Francisco: no, I prefer this one.
Alex: mmm, Ok.
Francisco: Look those kids playing with that dog.
Alex: Yeah. they are having fun.
Francisco: It´s getting late Alex and I have to clean my room. 
Alex: Really? 
Francisco: yeah.
Alex: Ok bye. I will take this way.
Francisco: Me too. Bye