How much for a 10 year old and 4year

The price is the same. However there are deals on the Legoland website where you can get tickets starting at 19.99 and then the price goes up depending on the extra features you add on. Also until the end of the year there is a deal where you get one free child pass for each adult paid entry (for up to 3 adults per transaction). You can get the coupon code from Lego store or look up promotions on Legoland website.

Buy your kids some Legos.