It's really great that your back into biking and getting the whole family into it too. Biking is a great family recreational activity. As for upgrades to the bike, I agree with the other members. I would ride the bike as is until something breaks and needs replacement unless it was a contact point (saddle, grips, or pedals) that were really uncomfortable which would hinder or deter you from wanting to ride. Upgrades can get very expensive really quickly and may not be worth the investment on a lower end bike unless you absolutely love it. Anyways, welcome to the community.