Best ISP? My family streams movies, lag?

So how should I choose ISP and internet plan according to my situation?

Basically when I relax and want to play a few games online. My family constantly streams movies with their devices, iphones, laptops. It's crazy.

It basically renders my side useless. My ping spikes up to 8, 000.

Is there an internet plan or internet service provider that targets these problems? Movie streamers?

It depends what service providers offer what in your area. I'm guessing that they are streaming movies from a video service like netflix. Netflix recommends a bandwidth of at least 1.5mbps and 3mbps for "HD". You should choose a package based on how much bandwidth is being used at peak usage times in your household.

Virgin is the ebst for £30 per month you get 120mbs meaning you can download a song in less than 2 secs
a film in approx 40 secs and a game 30 gb in less than 20 mins