Son and daughter in law separating

My son has told his wife of almost 15 year, with two young children (6 & 4) that he wants a separation and probably a divorce. He has already moved out. My daughter in law is devestated and my grandchildren are missing their father and can't understand why he has done this. I have tried speaking with my son. He has many reasons why he wants out of the marriage and really does not want to work at saving it. I don't know what else to do. Neither my son nor daughter in law have actively asked Christ into their lives but my daughter-in-law does believe in God and I believe is seeking Him at this time. I would really covet the prayers and insight of Christian women who have gone through this or who are compassionate towards those who are.

Daughter Needs Encouragement and Protection

We are missionaries in Brazil and have three college agers in the US (one at home). My 19 year old daughter is selling books door-to-door this summer in a strange city by herself (with a reputable company). She knows the Lord but she has not walked closely with him in the past years. I'm asking prayer that she will seek Him in this challenging job with long hours and that He will protect her and bless her so that she knows she can trust and walk with the Lord in a personal way. God is able. Thank you.