Teddi Mellencamp’s 5-year-old son, Cruz, broke his thumb while on a bike ride with his dad, Edwin Arroyave.“Please explain to me how you’re with Daddy, you go on a bike ride, you fall down, you break your thumb and now you have to get a cast?” the Real Housewives of Beverly Hills star, 39, asked the little one in a Monday, August 3, Instagram Story video.