The example of 's for is is in the sentence: 'My friend Mason has got a big family. He has got two brothers two sisters and 35 cousins. They all live in the same street! In Masons house there are a lot of pets. They have got two dogs three cats four rabbits and a parrot! They have got a big house and a big garden, so there is lots of space!' - Specifically, in 'Masons house there are a lot of pets'.