Article continues below advertisementRobin Wright is opening up about what it was really like co-parenting with ex-husband Sean Penn, with whom she shares two kids - Dylan Frances Penn, 34, and Hopper Jack Penn, 32."I have a huge regret as a mother and have experienced the fallout of this regret for many years with my kids - I wasn't hard enough on them," Robin, 59, told The Times of London in an interview published Saturday, August 30.Article continues below advertisementSource: MEGARobin Wright admitted co-parenting with Sean Penn wasn't easy.