kfrenette,
There are lots of things to consider here and you have given no specifics.
You can get a little (cheap) inverter or a 12 adapter for the laptop.
Unless you have added some, your HTT battery will probably not support much of a television for very long. You should look it over and find a power tag an think about an inverter that is large enough to handle that plus. Remember that the 12V current drain will be about 10X the 120V current. So, if you don't have a house banks that would sink a small boat, get the kids some books.
Matt