RSV and family

So I am a first time mom and it took me five years of fertility treatments and a miscarriage to get my baby. My baby is six months old and my in-laws keep her four days a week while I work. My SIL little boy was diagnosed with RSV and pneumonia and is being hospitalized for it currently. Am I wrong for telling my in-laws that if they go to the hospital that they cannot watch my child as I don't want to risk her health.