First of all Artdecogran congratulations on your new grandson! ?
When I look at my grandchildren, indeed any little ones, I find myself more scared for their future than I am for myself so your fears are entirely understandable. Also normal but I also think that the enforced inactivity we are being obliged to undergo doesn't help. Most of us are happiest “doing something” it’s what Mums do - so perhaps once they are home (depending on where they live) you can offer practical help - cooking, baking, ironing if near enough, but also Zoom or FaceTime contact with the boys, if they are little, reading them a bedtime story or hearing their reading.
Most of all, you will not want to add to any worries by getting sick yourself - so stay well - they need their Gran and when this is over you can enjoy that relationship with the new little one.