Welcome to planDisney, Vladimir!
In just 3 weeks' time, you'll be boarding Albatros Air and heading to
The Most Magical Place on Earth. If you want adventure in the great wide somewhere (and if you want it more than you can tell) then you're going to be in awe of all the EARidescent excitement that awaits you for the 50th Anniversary Celebration. In the words of Jasmine, "It's all so magical."
Purchasing
Disney Genie+ for your trip is a good idea. It'll help you enjoy more attractions and cram even more magic into your day. Children under the age of 3 are considered "Guests of Mickey" and therefore don't need a ticket (or Disney Genie+). I'm not sure how old your toddler is, but unless she is under 3 years old then you'll need to purchase Disney Genie+ for her too.
For rides that the little one can't go on, you should try taking advantage of
Rider Switch. One of the parents can wait with your toddler whilst the other two family members enjoy the attraction. When the other parent returns, they can switch and supervise your toddler. The waiting parent can then board the attraction with the older child without having to wait in the regular standby line again.
My wife and I took advantage of Rider Switch on our last Disney trip. My oldest loved it because she got to experience attractions twice! And we loved it because we got to enjoy the same rides with her.
I hope that's helpful, Vladimir! Have a fantastic time with your family.
Mike