The actor, who played patriarch Martin Goodman on the much-loved Channel 4 comedy, died at the age of just 54 after being diagnosed with a brain tumour.
Writing on Twitter, Rosenthal - aka younger son Jonny - told followers: "Thank you for all your messages, they're a testament to how great an actor Paul was and how many lives he touched.
"He was the most devastatingly intelligent and conscientious person with an unmatched crossword acumen and an incredible memory. If he met you once I swear he knew your name for life.
"Luckily for us he turned such a wonderful mind to bringing life to Martin Goodman for whom he would do whatever it took to make us laugh.
"Anyone who's seen Friday Night Dinner knows the amount of shit we put him through and I never once heard him complain.
"I'll be forever thankful for working with someone who was so supportive and who taught me so much about professionalism and humility in acting.
"It was a total pleasure and honour."
Meanwhile, a Channel 4 spokesperson said: "We are so saddened to hear of the loss of one of our favourite actors Paul Ritter. Our thoughts are with his family, friends and colleagues."
Ritter and Rosenthal will be seen alongside fellow cast members Tamsin Greig and Simon Bird on a 10-year anniversary programme which was pre-recorded last year for broadcast later this year. body check tags ::