It may be too far and kids may not be able to enjoy surfing at this age, but if you like huge waves, you can actually go to Baler which is nearer and cheaper. You won't have to pay for plane tickets :) they also have cheap accommodations Baler you can check them out at TripAdvisor because that's where I usually check hotels and resorts. :)
Promo terbesar expert care sudah dimulai, diskon hingga Rp.100.000 sedang berlangsung di shopee, ada juga voucher diskon 100% alias gratis bagi bunda yang beruntung. Buruan cek di https://shope.ee/9UfEMMqqTg (id-6115)
If surfing is purely what you're after, then Baler or La Union may be better choices. :) The waves are smaller and easier for kids to surf on. I heard that, all year round, Siargao has huge waves. Have fun! :)