I have to really work to get my kids to want to go to the cinema - they aren't (yet) wow'd by a movie being out 'sooner' than we can see it on netflix or similar, and the experience for them is just better at home. I love a great cinema trip, but we barely go once as year, as our at home set up scratches the itch.
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I have a purely 'ok' set up at home - more involved than some peoples, but nothing fancy:
In my living room I have a 120" diagonal screen (£30 from amazon) that we manually pull down the 12 to 24 times a year we use it. I have a schools short throw hd projector that was £70 delivered from ebay and then a set of £15 (2nd hand) pc speakers that are a sub and 2 speakers - all running off a 1st gen chromecast.
In my shed I have a marginally better set up of a mechanised screen (£70), then a more recent chromecast running to an hdmi splitter with optical audio out, which goes into a year 2007 5.1 sony amp (£30), with another schools projector (£130) - this set up came to about £250 all in.
If you have the room to keep the bits, I highly recommend a similar cheap set up - you can obviously spend loads more, but our cheapo living room set up does us proud and the audio is more than good enough for kids films. Means we enjoy loads of films as a family.