Sexing Jack Dempseys

[Hcazf]

i so am new to the hobby and i am loving it so far i just got a 75g tank with some jack dempseys from a friend who was getting rid of them. i have 4 of them in the tank one is about 4.5 inches another is about 4 inches and the other two are about 2 inches. i have been doing lots of research on them and i am wondering if they are a male and female and the two smaller are the babies? there isnt any aggression really in the tank they all seem to get along. the small ones chase each other around every once and a while but nothing bad. so i need some help sexing i cant really tell the difference i have tried really hard to figure it out but i figured it was time to ask some higher power i hope you all can help out! i know the two smaller ones might not be able to be sexed but i figured i would throw them in just for a shot.

this is the 4.5 inch one

this is the 4 inch one

this is them next to each other the big one in the front and smaller one in back

then these are the two smaller ones

 

[JackDempseyLove]

The first three look to be female and the last one looks to be male

 

[Andrewtfw]

Where have you been researching them? I only ask because much of the information pertaining to standard JDs (not EBJD), state information pertaining to the visible differences in M/F dempseys. Regardless, males tend to have little to no blue coloration below the eye and on the jaw, whereas females tend to have spotting, or blotches of blue spangling in this location.

 

[Hcazf]

i was reading on many sites and i read about the blue below the jaw but then i saw some pictures that were claiming to be males and they had some slight blue below the jaw so i wasnt sure about the 4 inch one because there is only a tiny bit but then it also said that the colors of males were much brighter and the 4.5 inch one has way more color than the 4 inch one so i was just so unsure