Usually a rooster doesn't sit on the eggs, but stranger things have happened.
I went back & looked closer at your pics. Your Sebright does have a large comb for a hen, but doesn't have the waddles to match it. That makes me lean more towards hen.
Your Lakenvelder is a challenge. At 4 months...
greenacreshens,
If I were you, I wouldn't give them away until I was sure they are roosters. At 4 months old, they should be crowing if they are really boys.
Jean
I'll give it a shot.
The first one is colored like a Silver Duckwing OEGB pullet, except her legs look too yellow. It may just be the picture.
Second one: Golden Seabright.
Third: Looks like a Partridge Cochin.
Fourth: I'm not familiar with this one, note the white earlobes. I'll have to...