In one sense it is like the dollar; in another it's like gold.
It is like the dollar but there isn't a central reserve bank nor is there a government deciding policy; nor are there banks deciding the validity of transactions. "So how does it work?"
There is a ledger of transactions - a public ledger of all transactions that have ever taken place. Groups of transactions are added to this ledger every 10 minutes.
Math (cryptography) keeps the process safe.
If they're interested in how transactions are added to blocks; how blocks are considered to be valid - well now you're into technical discussions. If you don't have a grasp you can watch youtube videos with your family or side step it by asking how a US dollar is created: how is the paper chosen, the ink added, etc...