It doesn't matter if you're happy now. You're whole relationship is built on lies and betrayal. Loyalty and morals are hard to come by. Those who betrayed you were never there for you from the start. The wrong isn't in your corner, it's in theirs.
Family Karma: The law of karma maintains that every action has a “cause and effect,” meaning that each action produces karmic energy that will eventually return to you. This energy could circle back to you in a future lifetime or could be passed down your family lineage, which is known as family karma. http://www.transients.info/2016/12/healing-family-karma/