Hey Elderly Aunt, how do I tell my parents to turn off the cable news while they watch my child?

My parents watch my youngest child for me maybe once a month. They have a “news” program on a television in their home during almost all waking hours. I am strongly opposed to my child being exposed to the inaccurate and divisive vitriol that this media company is known for. How would you address this, while also expressing appreciation for the childcare?