You could try to eat similar meals if you're having problems with your family eating meat. For example, you could make stir fry but you could have veggie quorn pieces in your pan and they could have meat pieces, but you could share the veg and do the noodles together, etc. This could also work for things like fajitas, hotdogs, etc.
There are loads of veggie alternatives in supermarkets now - many do their own brands. The freezer and fridge sections are full of fake sausages, meat slices and loads of ready meals.
You could try and get the whole family to eat something that is naturally vegetarian - like a mushroom risotto, cheese and tomato pasta bake, etc.