At times, family members who don't get along pay less attention to decisions made that affect someone else's work area. They accept decisions that they are not comfortable with because they don't see it as their decision. Having collective responsibility says everyone who is involved in the operation is responsible for the decision. It's a very powerful tool for encouraging people to speak up. Another part of decision making to consider is the relationship between trust and risk.
Trust involves risk.
Part of risk is supporting someone's efforts to take on a challenge. When you trust someone you accept the risk that some things will be out of your hands. There may be times when you feel uncomfortable because a decision has been made but someone else is responsible for doing the job. We made this decision. It's your area to implement.