Like charmingbaker, we went completely gf at home (two coeliac DC). For a while, I tried it the other way and it was an absolute nightmare. I had to do that because one DC was still waiting for testing so had to keep eating gluten. But I was constantly on edge, having to think about what touched what, and also watching everyone else to see they didn't make a mistake.
Now it's much better. Nothing that contains gluten (or oats, even gf ones) comes into the house. Blanket rule, don't even let visitors bring anything - if they don't like our food, they don't have to stay!
I replaced a LOT of kitchen equipment - toaster, grillpans/baking trays, casserole dishes, wooden utensils, sieves, colanders, graters. Expensive, but worth it IMO.
I chucked out / gave away flour, pasta, biscuits, preserves, stock cubes, gravy powders etc etc. Completely washed out all kitchen cupboards and scrubbed down kitchen.
This way we can all share meals, all eat things without fear, and there is a 'safe space' for the DC - the only one that exists for them, and to me that feels important. Everywhere else they have to be super-careful about cross-contamination, but I don't want home to be like that.
As a bye-the-bye, DH and I (neither of us coeliac) both felt a lot better digestive-wise after going almost-gluten-free (we eat gluten outside the home, just for convenience). For about 6 months we both had massive bread-cravings and would order the bread-bowl on our (infrequent) meals out. But that just disappeared, and now neither of us are in the least bothered - if we eat out without the DC, then I'll often choose a gf option if it's there. If we eat out with the DC, we always all eat gf - easier because DC still young, so we still have to cut up food etc. and don't want to have to keep thinking about what utensil has touched what. Also nice to be able to let them try something from your plate.
But your DC aren't coeliac (although they will have a higher chance than average of developing it at some point in their lifetime since they have coeliac relatives) so it's possible you don't need to be this careful.