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Good morning, I am Lawyer Ak and I will be assisting you today.
Your daughters child benefit will not affect extension of their visa but if you are not in receipt of £18,600 per annum this can affect their visa.
Where you previously in employment?
How much does you husband earn?
Your husband would be able to meet the financial requirement however as the visa is on your basis the home office can dispute application as you do not meet the financial requirement.