How about Rads optional Front Rack? It can carry 14 kg/30 lb and is rigidly frame mounted so your load doesn't flop around while you steer. It has screw bosses for securing Rads optional small or large "Basket" (or their Platform), and Rad also sells different sized zippered bags which are custom fit to their Baskets. An alternative to a Rad Basket is the good old plastic "Milk Crate", in single or double sizes (and accenting colors), which can easily be zip tied to your rack if you use enough good quality strong ones.
There's also the Rad Front Mounted Basket at:
https://bit.ly/3mv92XQ which combines a front rack AND basket into one unit and seems to match the styling of the Wagon with its wood bottom BUT it isn't rated to carry as much, only 10kg/22 lb. Just be aware that the added width up front can make the bike harder to maneuver around some obstacles or fit into bike racks. I had my Rad Large Basket mounted similarly (long dimension sideways) up front for a while and it definitely was a liability on trails, but that probably isn't the kind of thing you're likely to be doing with a couple of kids on the back. Although it doesn't offer the myriad of combinatiions possible with the separate rack/basket/other container approach, sometimes simple is better IF your intended loads are always on the smaller and lighter side.
It probably wouldn't be safe to try to use pannier type bags with a Rad Front Rack as there's no side bracing to secure them to so they would tend to flop from side to side and could hit the front wheel, not good. However, even the small Rad Basket can probably carry more stuff (by volume) than a lot of the more reasonably priced so-called panniers I've seen, and you could always strap one or more small to medium sized bike handlebar or frame type bags directly to the sides of a Rad Basket if you need more places to stash small stuff.
Carrying loads up front has other benefits as it allows you to keep an eye on things in case a bungee breaks or starts slipping, or if you need to quickly stop and grab something important for the kids (like cookies/biscuits!), and you my not even have to get off the bike.
Although I have a Rad Large Basket and Platform, lately I've just been using the Rad Front Rack bare on my RadMini. I can carry one or two reusable shopping bags (the kind with the separate plastic piece on the inside at the bottom for reinforcement) secured to the rack (wrapped) by one 4 foot adjustable bungee each, sometimes hitting 10 to 12 pounds of groceries per bag (I measured some of the heavier feeling ones when I got home). I'm way over 50 loads and haven't had anything come loose, yet.
I have been trying to work something into this reply subtlety, but without success, so I'll just have to come right out and say I fondly remember Manneken Pis (like may others who have visited Bruxelles).