Matthew and Cassi are either best friends or worst enemies. Most of the time best friends thankfully. They play together most of the day and they are usually playing like they are dogs or cats, playing superheroes or house and they love to play in or climb on Matthew's swing. They love to play with Brinlee too and get very upset when she is taking a nap. Watching these two little monkeys play all day is very entertaining to say the least. never a dull moment at our house. As you can see one day, mommy made goo for them to play in. Very messy, but fun!