He would require a visa in order to enter the country.
Only the UKBA (Home Office) may take the decision to deport someone and in order to do so the person has to either not have leave to remain here (ie. a visa) or must have seriously breached the terms of their visa.
You can contact the UKBA by using the information on the following page if you think he is in breach of his visa or does not have a visa:-
They will not give away confidential information but they will check what you report to them and then take any deportation action appropriate.
If you are concerned about his behaviour towards the child/you/your family then you should speak to the police or possibly a local solicitor about applying for a non-molestation order. As he is the father of the child he does have right to apply to Court for contact with the child however, this can be protracted however.
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Right. If he is making threats like that then you need to speak to the police but also include details in your email to the UKBA to the address provided in my previous answer because this speaks against the requirement of "good character".
It is up to the son if he wishes to press charges in respect of the assault.
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