Live call Q

I was listening to a live coaching call, the live call with Bev for this month, she coached someone and I have a Q about it.
She coached a woman about wanting to make a magical experience for her young son in decorating cookies, but her problem was that her brother-in-law is present and his behavior is unwelcome.
The coaching told her to focus on her son… I don’t get that? How can she try to keep the magic while her brother-in-law is swearing in ear shot? Or whatever his behavior is? This makes no sense to me…