I agree, take pictures.
We took pictures from day one when they broke ground on our first home to build. I have all the pics from ground up. Same with our current home... pics from groundbreaking all the way up.
We were there from 1992 until 2000 we decided to upgrade, get more space and larger yard. I looked forward to my new bigger house. We are a family of 3 and we went from about 2500 SF to a little over 4000 SF with a huge private wooded yard.
We still see the old house when we drive by, only 2 minutes from current house and on the way to the expressway. We look at it with pride... WE planted those trees, WE took good care of the house and WE know the owner now loves it , appreciates it and he takes awesome care of it.
One thing I did was in the old house, we backed up to a nice golf course and I didn't realize how there was NO privacy. Someone was always on the course, could see our back yard, I got tired of the cat calls, and I was ready to move when we did.
Now, I have a much larger lot, larger house, back up to woods so I share my yard with bobcats, coyotes, and other wildlife. I love it. I have SO much privacy now... I can go out back naked if I want to!
It is normal to feel sad when you leave but keep in mind that you'll be creating new memories for your daughters and I bet they will love the extra space!!
Good luck.