Sort of.
You could settle monies in trust, either inter vivos or in your will, with the income on that sum (or a specified fixed percentage) payable on a periodic basis to your relative throughout their lifetime, with any remainder to be inherited as you direct.
Alternatively, you could establish a discretionary trust and leave it up to your trustees to decide when to distribute funds to your relative.
It would probably be best to have a chat with your solicitor to discuss the best approach in your circumstances.