June 29, 2016 03:20 PM

Sara and Erin Foster are weighing in on their father David Foster‘s split from Yolanda Hadid – and her battle with Lyme disease.

“We don’t comment to our friends on Yolanda’s health. That’s not for us to comment on. Only she knows her journey, but what I will say is if you’re capable of continuing to be on a reality show, you’re not dying,” Sara, 35, said on SiriusXM’s Dirty, Sexy, Funny with Jenny McCarthy Wednesday. “Let’s be honest.”

Erin (left) and Sara Foster
Taylor Jewell/Invision/AP

David and Hadid announced their split after four years of marriage and nine years together in December. Foster was diagnosed with Lyme disease in 2012, and her health struggles became a contentious issue on the latest season of The Real Housewives of Beverly Hills when costar Lisa Rinnaquestioned Hadid’s diagnosis.

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Sara and Erin, whose VH1 comedy series Barely Famous parodies reality TV, say their father never sought reality fame on on RHOBH.

“Again, we are not doctors. We have no idea what goes on, and we don’t wish anyone ill will of any kind,” said Erin, 33, of Hadid’s health struggles. “However, I think that from everyone’s experience, if anyone’s ever known someone who is very sick, who has cancer, who is dying, who’s in the last year of their life, the only thing that person gives a s— about is getting through the day and being treated normally. No one wants everyone to know how sick they are and everyone to see how much they’re struggling, and when that seems to be the focus, making everyone see how sick you are, that’s just confusing to someone who’s trying to be supportive.”

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Hadid, who is not returning for the next season of RHOBH”, announced her exit in an Instagram post earlier this month.

“I believe that every exit is an new entry and with that in mind I say goodbye to my @Bravotv Family as I continue to focus on a my recovery, my children and bring back the privacy within our Home,” Hadid, 52, wrote. “Thank you to all the fans for your love and unwavering support these past 4 years. I am grateful for the housewife experience and all it has taught me.”

Hadid has a memoir about her health struggles due out in February 2017.

“I am determined to find a cure affordable for all,” Hadid previously PEOPLE of the memoir, Believe Me: My Battle with the Invisible Disability of Lyme Disease. “And it has been my dream to write a book to share all the treatments, knowledge, and spiritual growth I have acquired these past five years.”

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