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Good afternoon, to apply under the Eu settlement scheme you would need to show that you are dependent on your son. You can try making an application under family life and private life to be considered under exceptional circumstances if your son is facing challenges it is not guaranteed it will be accepted.
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A human rights application as I mentioned under exceptional circumstances if your son is facing challenges or a skilled work visa if you can get a company to sponsor you.
If there are health factors involved then this can be considered.
Medical documents in support of this factor alongside psychiatric report should be submitted when making an application.
It was a pleasure assisting you today. Take care