I hosted a birthday party for my 10-year-old son. Not a single family member came. A week later, my mom sent out an invite—for my niece’s $2,100 Sweet 16. I sent her one dollar with a note: “Congratulations.” Then I changed the locks. Two days later, there was a knock at my door... My name is Evan. I'm 33, a single dad. My son, Leo, just turned 10. For his birthday, I’d hung blue streamers from the sagging fence, grilled hot dogs, and set out a massive sheet cake. Six of his classmates came, a w