The wonderful thing about hosting is that you can do it at whatever budget level works for you.
For appetizers, I'd get a handful of things to assemble an antipasto platter (cheese, olives, crackers, prosciutto, grapes, roasted peppers, you get the idea) and serve the same thing both nights.
For the family with an elementary kid, keep it simple! Spaghetti and meatballs (with ability to deconstruct as needed for the kid taste), roasted broccoli, and a green salad.
For the adults, I'd look for something easy with simple ingredients but interesting flavors - this sheet pan chicken w olives is great (
https://anewsletter.alisoneroman.com/p/sheet-pan-chicken-video) but you know your guests. Then roast some potatoes and use the same leafy greens for another salad (maybe with a different dressing or more interesting toppings - toasted pine nuts, candied almonds, gorgonzola, etc).