Is it possible to obtain a visa in Thailand through my children's education in North Phuket?

No issue if your kids are enrolled in one of the international schools here. Providing you meet the financial requirements for the “guardian visa”. 500k per person in a Thai bank account in your name. Must be in the bank for 1 month before applying (3 months for subsequent applications). The school will be able to supply you with the necessary documents for the initial visa and subsequent extension of stay. One guardian visa per child, so you’d need to have 2 or more kids enrolled if you both want that visa. Be aware that if the bank account is in your joint names the amount is doubled and you need a valid marriage certificate.