I presume that most people reading this post haven't got any children. The principle still applies: Do we watch TV to stimulate us and serve us? Or are we allowing it to master us?
TV as a master
Culture wants us to watch telly passively, allowing every idea change our thinking. Jesus wants us to be transformed by having our minds renewed with scripture (Rom 12:2, John 17:17). Active watchers of TV think critically: 'What is this programme telling me about God, myself and the world?' The problem is that television hasn't been designed to be engaged with actively. Most programmes exist to be accepted and enjoyed without hesitation. Passive viewers of TV are likely to let the telly become a master. It can become a God: whenever the television speaks we listen, the television commands we obey.
TV as a slave
I believe television is a redeemable gift from God. Largely the TV has become a master, it rules and reigns in many homes, but by God's grace Christians have the power to use television in a sinless way for good. Here are a few ways I think this can be done:
1) Watch TV and praise God for His creation- watch nature programmes that cause you to thank God for what He has made
2) Watch TV and praise God for narratives - God made us to be story lovers, hence scripture is written mainly in narrative. Through grace God has given many non-Christians with gifts in story writing. Praise God for those gifts by enjoying their work.
3) Watch TV and fear hell- the wrath of God is worse than any calamity ever captured in a disaster movie
4) Watch TV to understand the world- TV represents the worlds views and opinions. Watch the TV to understand culture and reason against it with non-Christian friends/family
5) Watch TV to learn contextualisation- watch TV looking for the gospel. Many programmes contain themes of redemption, atonement and reconciliation. TV can be an evangelistic tool in being a bridge to the gospel .
6) Watch TV to care about the world- God cares about our fallen world. Watch the news and grieve over sin and its effects.
7) Watch TV to provoke prayer- as you see and grieve over the effects of sin in the world pray for spiritual and physical restoration.
8) Watch TV to show self-control- Christians should be examples to the world of how to enjoy TV righteously. Christian lives should make the gospel attractive.
The TV can be a good slave or a terrible master.