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The first thing I will say is MYOB
Their marital life is their biz
If an abused party or parties does not know what to do and take ownership of their own affairs there is really nothing you should do

However since you are family friends and feel obligated to be involved,

The first point of call is to call the parents of the man or a pastor/imam/mentor to talk to the man and find out what is going on.

The person shd be a discreet fellow and someone who is experienced in this maTters.
You can help facilitate this

He is the head of his house hold and he need to ascertain his OWN vision for his family

Tragic but he has to take the lead

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