Both kids know the first name will be Silas but for the longest time we didn't have a middle name. If it was up to my kids, here is what DS3 would be named:
3 year old - Silas Scooby Doo Hamburger Hotdog
6 year old - Silas Thomas (after Thomas the train)
I just wanted to say that I absolutely, whole heartedly love the names of your boys.
Samuel was a top pick for me, and Eli would have been if it wasn't my ex-husband's nickname.
Silas is our DS's middle name ;)
I vote for your 3 year olds suggestion. So you-neek!