Let’s abolish inheritance tax. Let’s abolish capital gains tax.
Instead, let’s treat all income as, well, income, and tax it as such. Whether you happened to make it from being clever and lucky enough to get a job, being clever and lucky enough to find a high-interest bank account, being clever and lucky enough to invest in profitable shares, or being clever and lucky enough to have a rich granny who liked you when she died.
This seems both fairer and more efficient than the current scheme of treating “money that a person receives based on stuff they’ve done” differently based on entirely weird and arbitrary criteria.