Anything & everything with sentimental meaning. That includes whatever the children can look at or hold to have a memory of something from their lives as their children with me in my home.
You see, my mom died when I was 11 years old and us kids were torn apart from different families, abuse, and estranged by blood relatives. We had no connection to our mom all our lives and only had precious few memories in our minds to lean on, which is fine until you grow older and have memory problems and things become distorted.
A child at any age wants a physical link to the parent they loved and lost but were denied. For all our lives we have always felt like lost orphans, even from each other, and I don't want my children to ever go through any of that.