I was wondering if someone could sniff the packets I send via my computer with something like Wireshark I guess even if I use TOR and the person could access the router like stated.
The communication between Tor's exit nodes and the Internet is not different from normal traffic which thing makes Tor also prone to MITM attacks. Entry nodes do not cause a problem, but exit nodes do.
To answer straight forward to your question. it depends on what you mean exactly by see my requests. In practice, by design TOR is such that locating the source of such request sthrough the network should be difficult to determine, including your typical case.
However relying on unencrypted protocols (such as sending emails using SMTP) leads to your TOR requests being able to be entirely monitored (or seen, in your own vocabulary).
The traffic between your computer and the TOR entry node is encrypted, so it is not possible for someone to see the unencrypted content of your TOR traffic between your PC and the entry node.
The traffic between the TOR exit node and the site you are accessing is not always encrypted (depends on the site), so it would be possible for somebody to sniff and see that traffic in unencrypted form.