Post MBA Employment Family VS Finance

My Background

I come from a third world country and did my undergrad in a good school in Europe mainly focused on hospitality (Ranked top 3 in hospitality) got a BBA and two hospitality diplomas and a specification in marketing. I then went to work at my family's firm we own restaurants across the Middle East 13 locations to be exact and mainly franchised with Private Equity Firms and different kinds of funds. The experience was good I got promoted to Directors of Finance and Buisness development two departments created when I stepped in the firm. I then went on to studying alternative asset management with Cornell and corporate finance with Harvard I earned a certificate from both with As in all of my classes. I have completed an investment banking(at a local bank) and deals advisory internship at a Big 4 accounting . Any advice on whether I should stay with the family firm or bounce. The firms EBITDA has been dropping by 33% and overall mainly due to missmanagment (did a research with a Masters in Business Administration class from Stanford and the students gave us recomendations ). After trying to discuss the issue with the CEO (dad) he doesn't seem to care much he wants me and my siblings to get along but I feel he's just not ready to give up power. No real succession planing and we basically spend the day doing simple stuff. He wants me to spend the day at restaurants now and abandon the job descriptions.

Its not that im bored, I just dont see how I would be able to work with my siblings and father. Dad has a huge Booz problem and my brother is constantly getting stoned and lately started growing pot in the headquarters this is just crazy for me.I can't have a family in such an environment. If such behavior is acceptable then I dont know what the future holds: money laundering or some shit like that. Its just unsafe for me, I should probably discuss it with the fam but then again I tell myself why not just leave and do my own thing. An MBA would give me the option to gain the knowledge to better lead the Buisness this I have no doubt, as you can see my family is not big on education they see it as a waste of money. I dont want to play the blame game and that why im considering leaving.I'm considerig Bschool at Harvard or Stanford and then moving into PE or investment banking I don't want to stay in the Middle East I'm also on the National team for one of the sports that I played in college and I started an NGO that helps refugees. Any advice would be appreciated.

Should I walk away ? Do my Masters in Business Administration MBA and reconsider ?