Sex of Two Supposed Roosters!

[NoFlyBackFarm]

These two are 3-4 months old and no crowing.... I was told they were roosters in a previous forum. Now I am not so sure, they don't have big combs. Some of my hens have larger and the big rooster (father) does chase them off. Any ideas? They were both hatched by my 8 year old hen...
One:

A little younger (one+two):

Two:

Father:

 

[NoFlyBackFarm]

@aart @Crazy for Chickens! @Wyorp Rock @Eggcessive

 

[Crazy for Chickens!]

All are cockerels.

Size doesn't matter so much as the redness of the comb.

 

[Gray Farms]

Both are cockerels.

 

[drumstick diva]

cockerels

 

[NoFlyBackFarm]

Okay thanks