I mean I know it can be done, but how do I do it exactly?
If it happens again and you want to check if a transaction is dependent upon another unconfirmed transaction then search for the transaction ID in this website.
https://blockchain.info/
When you get a result like the one below click the link named "Show scripts & coinbase" on that page. The advanced view will then open
https://blockchain.info/tx/defa67a4595348f0cb1387104d8cccca755a88d327717a36496f5be9ee6c2f31
Any input to a transaction that is dependent upon another unconfirmed transaction will be marked with a red letter U like the one in this screenshot. If you see a red letter U the transaction is dependent upon another unconfirmed transaction.