Should I Call The Cops?

Ok...So My Sister calls me at 1 in the morning telling me that my dad has been threatened with getting the house burned down if he calls the cops...My parents have been living in the same house for over 10 years now and next to them is an abandoned house that has broken windows basically its in no condition for no one to live in...The problem is that in that house some 17 year old and his friends are keeping undocumented people there...My dad threatened them to stop keeping people there and then its when the kid threatened my dad with burning his house down...My dad all scared just walked away and told his oldest son and of course he did something about it and he called the cops...Cops and Border Patrols arrived and the undocumented people were taken away...My sisters are all scared now and think that the house is going to get burned when they are alone or even when my mom is alone...What can I do please Help Me I Don't Want My Family Harmed...