You will need a visa initially. H1, H4 , spouses etc. Then this needs upgrading to a Green Card. I can say this because I am a British national livingh in the US
Of course they can!
They can live where ever any cats can live. The tabby coat is just a pattern; any breed cat can have it.
No, they all still currently live in the UK.
British
no he lives in America i believe
Nationality is subjective, since some people consider where they were born to be their nationality while others consider where they currently live to be their nationality. Language tends to not influence nationality. For example, if you were born in Russia but moved to America and speak english, you could still very well say you're Russian since it's where you were born. Language doesn't generally determine nationality, but people can identify with any nationality they choose.
Most live on the continents of North and South America, although some have emigrated to other countries and retained their original nationality.
American
Swimming has no nationality, but is done competitively in america. (Especially in college.)
An Australian national cannot live in the UK indefinitely without the appropriate Visa, or some other qualifying criteria being met. The nationality of her children MAY mean that she is allowed to remain in the UK to live, IF the are of British nationality. Being born in the UK to parents of mixed nationalities does not automatically bestow British citizenship or nationality, as the parents can (usually) opt to have the child registered after birth in the nationality of either the father OR the mother - or in some cases they MAY be able to obtain 'dual' nationality, though this is a long, tedious process. This is a question to which the correct answer is dependent upon specific circumstances, and accordingly, only the appropriate authorities could advise fully and correctly ... we've been through it twice in the last 4 years!
America
America