I've know these girls for 2 years but didn't know this about them until a few months ago. I'm a thin woman and my husband is thin. All his daughters are on the heavier side.
Since getting married and living with them, I've noticed that it's a routine occurrence for there to be an exchange of body shaming between 2 or all of the girls. Every time I tell my husband, he says he will tell their mom to talk to them. But it still continues.
Just yesterday, the 3 of them were it again. The 13 year old and 15 year old actually ended up crying while the 10 year old was laughing at them. I tried to parent and I told the 3 of them that they are horrible to each other. I told them to apologize but neither of them did.
Today, my husband again, refuses to talk to them as he said weight is a very sensitive topic for girls. It would be an awkward conversation for me to talk to their mom, one-on-one. I'm not sure what to do.