You and your brother use your mom.

Dad: I'm leaving for work, good day everyone. You are still at the dinner table and after your father closes the door, your brother gets up from the table, lifts your mother up to the counter and starts undressing her. Mom: Come on, little son, you join your brother and fuck me. While your mom invited you over, your dad came back home to get his hat and saw your mom and brother having sex on the counter.
Dad: How can you do this to me, big boy? I'll have you thrown in jail and I'll talk to you later, my wife. Your father takes his brother and leaves. Your mother is crying naked on the counter.