The CD you find has a copy of your father's website: homepage.html[1]. Maybe something is hidden in the site...

hint:You may want to use your browser to view the source of the web page.

[1]https://picoctf.com/api/autogen/serve/homepage.html?static=false&pid=3099c443d360a2514f17f155fb65d5d2

(seems like this link doesn't work every time as it is auto generated