$100? I’m afraid not. That will get you a nice eyepiece for a good telescope.
Although your purpose is slightly different, here’s a recent thread about beginner scopes.
I have several scopes, and have for many years, and I always recommend newcomers to read Telescopes 101. It will answer many of your questions.
The problem with children and beginners of any age, is they want to see something they know. The moon is easy for any scope, but Jupiter and Saturn will just be a tiny dot in anything smaller than about 5 inches, and 10 is really preferable. Probably close to 90% of scopes get put away forever when the user can’t see what they want to, or find anything interesting to look at.
At my recommendation years ago, my SIL bought her kids this scope. While at their house recently, I told the kids to grab their scope and I’d show them some things. I tried some settings and using the motor drive to no avail. I looked in the case, and found the instruction still taped securely in its bag. They had never read how to use it, and consequently ruined it by twisting it this way and that way, and breaking the clutches.
I had assumed their father would help small children with an expensive, complicated device, but I was wrong. He was the one who showed them how to break it!
The point is, to get a scope they can see interesting things in requires some aperture and complexity in the form of a “Go-To” scope that is computerized, and young kids must be supervised with such things.
If you think they’ll be happy just looking at the moon and far away birds, then a small, inexpensive scope will work. If they just have to see the rings around Saturn, then you start here.
There are several us backyard astronomers on here, and they’ll join in shortly I’m sure.
Read 101, and come back and ask more questions.