You're a 19 year old kid, dealing with the recent and devastating death of your mother. Your father doesn't seem the least bit rattled, and is moving you two across the country to his new girlfriend's house. The timing seems suspect to you. But you're quickly enamoured with the Walker family, and the strong women that occupy it.
In order for you to be able to install this game, you need to enable (allow) installation of applications from unknown sources (Unknown sources) in the phone settings. Usually this item is in the Security section