The quote on the shirt says "Happy families are all alike; every unhappy family is unhappy in its own way." It's from the book Anna Karenina by Leo Tolstoy.

Edit: apparently many people don’t get the quote from the book. It’s not about happy families being bad (who even thinks that?) it’s about how hard it is to be a happy family because everyone in the family must be good to be a happy family, but unhappy families are easy because it only takes one bad family member to become unhappy (like an alcoholic dad or a narcissistic mom, etc). This is actually a general concept applied to many aspects of life and society.