Pawan, at this mini and micro Djok thing. I think it's too late for Marko, he should be playing challengers and futures, he is 20 yo and accomplished nothing.
Little Djordje could make it IMHO ... I just hope he is serious about tennis.
What Nole is doing for his family is great ... but they need to somehow learn to be independent ... Novak was, if I remember correctly, only 5 years old when he started playing tennis and he took it very seriously ... 20 years later, he is a multiple slam winner and world #1. I still laugh when I watch some old videos of Novak being only 8/9 years old and saying "I want to win Wimbledon and be #1"... it's actually very inspirational (especially to young people) ... if you have a goal and work hard it'll pay off