WOW, it's very hard to tell from these pics. When they are young it's next to impossible. As best I can tell by your pics, #1 is a male and #2 female. I couldn't tell on #3. However, don't bet the farm on my opinion. I bought 4 juvies, let them get older and after two months two of them paired up. I ended up with one male and 3 females. I put the two odd out females in my big tank and now the pair have a "honeymoon home" all their own.
They kept their first spawn for 48 hrs but I lost the eggs to fungus. I'll be ready with antifungal next spawn. They were really great parents while the eggs were viable. So fun watching them dote over their eggs! OS.