The data can be seen on the coinmarketcap website. Logically what happened this year when the price of Bitcoin had reached $52K, the price of Ethereum was still at $3.7 and $3.8.
Then you can also compare when the highest price of Bitcoin occurred this year was how much Ethereum was at that time. To me that's a rare occurrence in the crypto space.
Indeed ETH is far below BTC so we cannot see that the price of ETH has increased in price after the price of BTC rose first.
We can see that in the crypto market every time the price of BTC goes up, the prices of other cryptocurrencies also go up.