Hi Julie,
Welcome! Please don't feel as if this is an exclusive group or anything, anyone who finds the information helpful and can relate is more than welcome. It does sound as if your boys are advanced. It is nice to find a place to talk about these things without worrying about what others think about what you are saying. This is a great place for that. Feel free to ask any questions as they come up. I have a DS4 and a DD21 months. My DS was off the charts in his early developmental milestones, but my DD is developing quite differently. DS said his first words around 7 months. DD barely said a word until she was 18 months, and then randomly counted to 10. So it's interesting that they won't be doing something and then will all of a sudden start. DD knows all her shapes and a few letters/numbers/colors here and there. She is definitely become a big talker, but is more of a singer than a talker, LOL. And she is not obsessed with letters and numbers like her brother was. It's interesting how differently children develop. You will start to notice more in the next year or so, especially if you are around other children the same age. That is when I really noticed things were different.