Robin Williams' son has paid tribute to the late actor's "weirdness and extraordinary capacity to love" in honour of his 75th birthday.

The Mrs. Doubtfire star - who took his own life in August 2014 - would have celebrated the milestone birthday on 21 July, and in honour of the occasion, Zak Williams urged fans to "do something kind" for someone in memory of his dad.

He wrote on his social media pages: "Happy 75th Dad! Today I'm remembering your weirdness and your extraordinary capacity to love.

"I remember those wrinkles in the corners of your eyes, the kind you get from a lifetime of smiling. I remember your unending need to see this world free of human and animal suffering.

"For those out there who'd like to celebrate with me, go do something kind for someone. Make someone laugh. Put a little more good into the world.

"Love you forever."

Meanwhile, Zak's sister Zelda has previously blasted "gross" AI videos of Robin and begged fans not to send them to her, insisting her dad wouldn't have wanted his likeness used in that way.

She wrote on her Instagram Story: "Please, just stop sending me AI videos of Dad.

"Stop believing I wanna see it or that I'll understand, I don't and I won't.

"If you're just trying to troll me, I've seen way worse, I'll restrict and move on.

"But please, if you've got any decency, just stop doing this to him and to me, to everyone even, full stop.

"It's dumb, it's a waste of time and energy, and believe me, it's NOT what he'd want."

Zelda described the videos as "over-processed hotdogs" made from "the lives of human beings".

She continued: "To watch the legacies of real people be condensed down to 'this vaguely looks and sounds like them so that's enough', just so other people can churn out horrible TikTok slop puppeteering them is maddening.

"You're not making art, you're making disgusting, over-processed hotdogs out of the lives of human beings, out of the history of art and music, and then shoving them down someone else's throat hoping they'll give you a little thumbs up and like it.

"Gross. (sic)"

The Lisa Frankenstein director blasted people who call AI "the future".

She added: "And for the love of EVERYTHING, stop calling it 'the future'. AI is just badly recycling and regurgitating the past to be reconsumed.

"You are taking in the Human Centipede of content, and from the very very end of the line, all while the folks at the front laugh and laugh, consume and consume. (sic)"