Are your services on television?
No, our services are not on television, but our sermons can be found midweek at our website under Sermon Media.
Is there an app that you could suggest as a devotional for kids?
I'm sure there are several good ones out there, but one that I know a lot of our families here like is the YouVersion Bible app for Kids. With this app, you are able to download certain Bible stories that either your kids can read through themselves, you can read to them, or you can set a narrator to read it. Once the kids have listened to the story, there are activities they can do based on the story. Another possibility is an app that ties in with the Sunday school curriculum that we use here at Gateway. We use The Gospel Project, and they have an app called The Gospel Project for Kids. I believe they just revamped this app, so I'm not 100% sure what all is on it, but if you search for Lifeway Kids in the app store and download that, the Gospel Project for Kids should be a choice to download from there.
I know you asked specifically about apps, but another resource that I highly recommend for families with boys about your boys' ages is the Action Bible. It reads like a comic book which is pretty appealing to a lot of kids. We are also planning to launch a family resource in January that we will send home each weekend. Part of this resource will be letting parents know what is coming up the next week in Kidway so you can read and study it ahead of time with your kids. There will be a 5 day reading plan, so if family devotions are something you do (or hope to start doing), there will be a short passage suggestion for you each night.
I hope that helps, and thanks again for asking! We're always excited when families want to help get their kids in God's Word more!