Step children

Anonymous • 24, married, TTC for almost 3 years. Love the app, community, and support from y`all lovely ladies.
How many of you ladies have step kids? I have 3 adorable little geniuses. It's really hard to keep them busy and away from the TV screen when their dad is at work. 
The oldest loves Pokemon, but his two sisters can only take so much of that. He also loves reading and learning. I have some apps on my iPad to help with that, but again, I want to keep them away from tech sometimes. 
Middle loves dressing up or reading. She's a girly girl, and usually keeps to herself. 
Youngest just follows the group. She's arty and I get my paints out every now and again for them. I have coloring books too.
What else can I do? I can't take them out as I don't have a car, and I have anxiety problems, so I worry all the time and I wouldn't be much fun.