Hah, the photo posts did seem out of the norm for you, now it makes sense. Very nice of you.
I'd say a Chromebook for each of the children and perhaps 1 for the parents and a point-and-shoot camera for the family. Laptops are nice but they tend to have more problems over time and with Google they'll at least be reliable with updates and security for some time. Not to mention they generally aren't very expensive and each child can have their own, teaching ownership and responsibility and freedom to do as they please with their device.
And a simple camera is important to save memories as the kids grow, it's important to have these to look back on and where they've come from