what do you do with your liar family?

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I have brother in-law especially the younger ( he is 30 yo). He is too close to something problem and his life. He never share to others, he always lied to us where he gone for one day. He always lied with whom he playing for one day. If he asked help to buy some food, so he be gone for 2 or 3 hours just for buying food. He is very spoiled by his mother. His mother always give him anything he want. When his mother pass away one month ago. He is more wild in out side, but i don't care for him anymore. What do you thing? Am i right? Do you have some experiences as same like me?