Take a look at the age-ability forums - somewhere there was a long post about what 2 y.o.'s are doing, or something like that.
And it doesn't sound like they talked "later" at all (LOL, my twin boys had zero words until around 3 y.o., and my only "normal" talker so far didn't start until 17.5 months, so perhaps my perception is a bit skewed).
Though I'm with you on one thing - I used to think most kids picked up the alphabet on their own, since my first child (dd) did that - probably somewhere around 3 y.o. But one of my boys with his speech issues had a lot of trouble learning the sounds. Still, none of them have ever seemed interested in me "teaching" them anything; poor ds who is 2y8m will have to suffer because the letters from the wooden alphabet puzzle are now scattered throughout the house. At least he knows the abc song lol.
From the perspective of a mom of late bloomers, it sounds to me like your boys are doing very well. Welcome
