Keep clinging unto God with all your might and he will give you the desires of your heart. Make him you first love and family next. Continue to care and nourish your little son for he needs you so much at this time. But don't give up, for sometimes God is doing work on the other person even though we can't see it.
It took me seven long years for my husband to see the light and come back to me, during that time I cling to God for dear life, he was my everything even though people thought I was crazy. Those same people today say, they would had never believed it in a million years if it wasn't because they saw with their own eyes what I went through, they call it a miracle. I tell them it was God who brought us back together loving each other more than ever before, Praise our Heavenly Father! Now I can look back and see how God was with me all along and how he was working on my husband, even though it hard for me to see it then.
Lord continue to help this man and his child and touch his wife's heart. Convict her Lord and may she return back to them repented of her sins and ready to be a good mother and wife. My he be able to forgive her as you forgive us, never bringing up the past for it will just destroy the work you are doing in them. May they become a Great testimony to other trouble marriages. I ask and thank you in advance in Jesus Precious Name always giving you all the Honor and the Glory Heavenly Father, Amen!