How much is it to Beijing?

I don't know which city your family lives in.

Take Hangzhou as an example, the train arrives at 300+ soft sleeper, 200+ hard sleeper, 13 hours.

Two days' accommodation, not a very good hotel, one day 120-200.

The food is ok, if it is not too economical, it will be about 4 or 50 a day.

The ticket prices in this city are terrible. If you live far away, you'd better take a bus. It's expensive to take a taxi and jump fast on the loop.

In short, if you don't go sightseeing and just watch the ball, you will be ready around 1300.