Hi Emma!
How exciting to be planning a trip to the Happiest Place on Earth with your family!
There are numerous attractions for guests of all ages. Generally, when you get to the front of the line for these attractions, a friendly Cast member will ask you for the number of people in your party. Once you let them know, he or she will assign an area for you to wait your turn for the attraction. It's completely up to you how you choose to make rider arrangements. If you want your 7 and 8 year old kids sitting together, they can certainly do that. If you want your mom and your four year old in the same car, that's totally possible too. Some rides, like the Jungle Cruise are fun because you all sit together and face each other.
Here is a list of my favorite "all ages" attractions at the Disneyland Park:
The Enchanted Tiki Room The Jungle Cruise
The Pirates of the Caribbean
Story Book Land Canal Boats "it's a small world"
The Mad Tea Party Dumbo the Flying Elephant
Buzz Lightyear Astro Blasters I hope this helps! Have a Magical time at the Disneyland Resort and thanks for submitting your question to the Disney Parks Moms Panel!
-Anabel M.