As a compromsie, you could choose Elizabeth Ruby Grace. Elizabeth gives you Eliza, Ruby is from yours, and Grace is both. If you seriously don't like Eliza that much, you could choose another nickname from Elizabeth such as Beth or Ellie.
For the boys, your three-name combos don't sound that good. They names don't flow well together. I'd narrow it down to Alexander Jack, Alexander Layton, or Alexander Mason. I like the last one best.