You have to look out for yourself in this situation. This is your future and family's well being. I have seen many family businesses fail after the parents hand the operation over to their children. I know there are consultants that can help coach the current owners in the correct way to have the business survive after they move on, you may want to look into contacting one. This may be difficult to introduce to your parents but your parents have a responsibility to you, your brother, their employee, the business, etc. If the transfer of ownership is not handled correctly the business will fail and can ultimately destroy the family involved. I wish you the best.