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Good afternoon, she can bring the kids on a family dependent child visa. She would be required to show that she has sufficient accommodation available for children and can financially support them.
I will send further guidance.
She would need at least 18,600 per annum from employment if applying for the husband. For the children if applying together then £22,400 per annum would be required.
She would need to show adequate maintenance therefore £24,800 for the children from employment. The children can apply after 10 years for settlement.