Wyandottes are a little different. Maybe it's because they have rose combs instead of single combs. Whatever the reason, we see the laced Wyandotte females with larger, redder combs at an early age pretty often in here. The thing to go by with them is the evenness of the lacing, particularly on...
It's too early to say with certainty, but my guess is that they're both cockerels. Within a few weeks males will show the deeper colored shoulders and the long, thin, pointy saddle feathers, so 12 to 13 weeks is the best time to tell gender.
They look right for white Legbars, but there are no guarantees unless you trust the breeder. Too early to tell gender but so far no signs point to any of them being a cockerel.
As for breeds,
2 is probably a Sapphire Gem or some type of egger
3 is a Legbar cross type olive egger or Easter egger
5 is a blue laced red Wyandotte
7 is a typical Easter egger, the type that was around before all the new designer Easter eggers the hatcheries are now selling.
I think it is a cockerel, too. The pictures aren't too clear, but the size and color of the comb indicate a male at 12 weeks old. Females would generally have smaller and paler combs at that age.
Tough to say for sure. Both are bearded, and they probably got that trait from the OE father. OEs aren't typically white, so the mother of the white chick probably was. Maybe a Leghorn or white rock. The other isn't as easy to tell, but when it's older it might be easier to make an educated guess.
It's either a cockerel of another breed or a Sapphire Gem pullet that is developing early. Male SGs should have the white spot on the topside of the head and barring, but this has neither.
1 buff Orpington female
2 buff Orpington male
3 blue laced red Wyandotte male
4 maybe a splash Andalusian or some type of hybrid. Female.
5 black lace3d red Wyandotte male.