I agree with wat ppl are saying.. I feel you need to always show that you love them, care for thum, and respect who they are.. Show approval on who they are and just not what they DO. you dont necessarily have to protest when you see them donig something wrong, rather very subtly show you wudnt do the same, because as said b4-they know theyre wrong.
Spend time with them to show that youre always their for them, but take precautions and make g’darim for yourself beforehand to make sure you are not negatively affected by them.. the power of negative Hashpa must not be under estimated