Can a grandson obtain British nationality by descendent?

Yes, a grandson can obtain British nationality by descent if certain conditions are met. Specifically, if one of his parents is a British citizen by birth, descent, or naturalization, he may be eligible to apply for British citizenship. However, if the British citizen is his grandparent, the grandson cannot automatically claim citizenship, as British nationality law typically allows citizenship to pass only one generation down. Each case may vary, so consulting with an Immigration expert is advisable for specific circumstances.