Small Discussion 1 Dicember 8th

Last week, we divided into small groups and discussed a topic. It was that if I am the son's father, what would I say to the police in the case?
First, we read the text and thought about it. When I finished reading the text, I thought the son should say the bag is his. However, I changed my opinion after discussion with my group member.
In our discussion, we had many kinds of ideas. First, Ms. Nanase said she would say the bag is hers so she would cover for the son. She and I had a different idea so I asked her why would you cover him. Then, she answered that if the police knows that marijuana is the son's, he could be jailed for life or worse, executed. Therefore, she wants to protect him so she would say that. When I heard her opinion, I noticed the side of punishment and I rethought about it. Of course, I want to protect him from the punishment too, so I changed my opinion and agreed with Ms. Nanase's idea.
Then, Ms. Azusa said her opinion. That was she would say "The bag is mine but I don't know the marijuana so maybe somebody put it in my bag." I thought her idea was good too so I hesitated which idea is better.
However, Ms. Misaki suggested that if the lie will be out to police, all family members may be punished by the country's low. When we heard her suggestion, we agreed with it. Even so, we want to protect the son so we rethought about it. Then, I suggested that initiating a contact with a lawyer is the best idea. However, one of the members said to me that it was good idea but at first, we have to think what we should say to the police in this situation.
After a few thinking time, Ms. Nanase suggested a good idea. That was we would say "The bag is my son's bag but I put the marijuana in his bag. The reason why I did that, it fell down on a floor in our hotel so I thought it belongs to my son and I put it in him bag. Therefore, my son and I didn't know it was marijuana!" Of course, it was a downright lie but we thought it was the best idea so her idea became our consensus.
After the discussion, I considered my group member's opinion and I found that all members said lie is the best idea. I think maybe speaking truth is one of the ideas so I want to discuss with someone who think speaking truth is the best.