It looks like Yolanda Hadid is getting no love from her ex-husband David Foster these days or his children for that matter. In fact, his two daughters, Sara and Erin Foster, basically shaded their ex-step mother and her well-publicized ongoing battle with Lyme disease.

In a new interview with Jenny McCarthy on her Sirius XM radio show (via People Magazine) this week, Sara hinted that Yolanda might not be as sick as she's making herself out to be. Well, at least behind closed doors.

She said, "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 then added rather bluntly, "Let's be honest."

Erin continued, "Again, we are not doctors. We have no idea what goes on, and we don't wish anyone ill will of any kind. 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."

Many fans believe that Erin and Sara might be hinting at Yolanda's well-documented struggles on social media, in which she shares photos of herself at hospitals and in bed.

Yolanda herself said last year, "I am determined to find a cure affordable for all. 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."