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Just call him the family guy!

RadarOnline.com has learned exclusively 44-year-old Seth MacFarlane is dating his much younger co-star Halston Sage, 25 — and her grandmother can’t wait to meet him!

“I don’t think there is anything wrong with them dating,” Helen Schrage confirms to Radar.

“Everyone seems to be okay with whatever she is doing.”

The funny Family Guy creator and the blonde, who’s nearly 20 years his junior, star together in the dark comedy Star Trek prequel The Orville.

While the twosome have kept a low profile about their budding romance, they were snapped heading to Sushi Park in West Hollywood, Calif., in February.

Despite the double-decade age gap, Halston’s grandmother says years has nothing to do with true love.

“If she is happy, we are happy,” she said, adding that when she heard the news she asked her son, Halton’s father, who said the actors are “good friends.”

“Age sometimes doesn’t matter. They are the ones to decide if someone is too old.

“Maybe she needs that feeling of fatherhood,” she joked. “I don’t think so because it’s a close family.”

But at her own wise age she has learned to keep her mouth shut when it comes to doling out dating advice.

“It is complicated to tell your granddaughter she shouldn’t do something and to give advice because they won’t listen,” admitted Helen.

“We can’t say don’t be with him, congratulations or it’s not a good choice. Only she can make that choice.”

For now, Helen looks forward to meeting her granddaughter’s famous beau.

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“I have not [met him] because he is in New York and she is there most of the time,” she continued.

“If he wants to meet me and she wants to, I’ll be here and open my arms to it.”

Before the former Nickelodeon starlet caught Seth’s attention, the actor-director-producer was linked to Game of Thrones actress Emilia Clarke, 31, and former Buffy the Vampire Slayer actress Eliza Dushku, 37.

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