Dayton Callie would be a good choice for a father to Paul in a movie.
In my opinion, he has very similar eyes and they're both great actors.
Dayton Callie:
https://imgs.search.brave.com/_hTge-FJoWiXp7beLSmQRLcnA4T2GDgO8QcXN15Bz3s/rs:fit:860:0:0:0/g:ce/aHR0cHM6Ly9tLm1l/ZGlhLWFtYXpvbi5j/b20vaW1hZ2VzL1Mv/cHYtdGFyZ2V0LWlt/YWdlcy8wM2MyZTY2/YzU3NGJjNTU1YTE5/MDc5ZjRkNTRjNmZh/ZmNiMDNiOTQxNDll/ZWRlYWIyNGM5NjJm/ZGFjNjhmNGJjLmpw/Zw
Paul Giamatti:
https://imgs.search.brave.com/MkHsdjP6rd6waAlNNwlzgwJ0M49-VKJzNRkiGfeh04A/rs:fit:860:0:0:0/g:ce/aHR0cHM6Ly9tZWRp/YS5nZXR0eWltYWdl/cy5jb20vaWQvOTU3/MDkxNTEvcGhvdG8v/bmV3LXlvcmstcGF1/bC1naWFtYXR0aS1h/dHRlbmRzLXRoZS1s/YXN0LXN0YXRpb24t/cHJlbWllcmUtYXQt/dGhlLXBhcmlzLXRo/ZWF0cmUtb24tamFu/dWFyeS0xMS5qcGc_/cz02MTJ4NjEyJnc9/MCZrPTIwJmM9UWZZ/X1o5RU4xbDlXNm9L/Z1NHdHRkQTFDNzFJ/aWhDd0kwYlRyTGw2/Z2pXUT0