As for the juice, I can't speak for anyone else but I don't like the Chinese stuff. They tend towards the chemically / perfumey as that is what the chinese like. I prefer USA made flavors. You would be better served getting a few samples first, then deciding which juice.
I actually don't like the tobaccos straight up, they do NOT resemble the cigarettes, nothing will. I started with the straight tobaccos, then moved to the fruits, then the coffees and desserts. Turns out I like the RY4's which are tobacco based with other flavors but NOT the ones from certain vendors. It has to be a good base. And I don't like the fruits. But others LOVE those flavors, so the 4 in your family may not even agree on what flavors. And if they don't LIKE a flavor, they certainly won't vape it. Being gagged with something you can't tolerate gets me right to a cigarette. Part of the fun of vaping is finding the "one" that you truly can tolerate all day.
Good luck!
ETA: If the flavor I had with my first ecig was the only one I had to try, I would never have vaped at all. It was that nasty to me. Luckily I had ordered other flavors and found one I could tolerate.