Can I just tell my grandparents not to come to my house anymore?
Why don't you want your grandparents in your house anymore?
They damaged my TV and lied about doing it.
I'm sure that you're frustrated with the damage to your TV, but your grandparents likely didn't do it on purpose. They are your family and you should help family members when they are in need. Kicking them out of the house will be very damaging to your relationship with them.
That would be okay. My grandparents are weird. They make me uncomfortable at times. I should get new grandparents.
I'm sorry they are like that, but it is wrong to kick out family. Maybe they weren't sure how to approach you or could have forgotten about it. I would cut them some slack since they are older. It is not really possible to get new grandparents, so you have to learn to deal with the ones you have.