It might be helpful if you explained a bit more of the circumstances.
Is this simply a case of your wife leaving you (whether temporarily or permanently we don't know,) or are you in the midst of a divorce and custody battle with your wife? If she has legal custody of the child, do you have visiting rights? I ask because, if this is actually a legal matter, I would look at the chart a little differently.
With Aries rising, you are symbolized by Mars. Your wife, with Libra on the 7th house cusp, is symbolized by Venus. Children are a 5th house matter: in this chart, ruled by the sun.
It looks to me like you might have some reconciliation with your wife. (Moon in partile sextile with Mars, Mercury appears to be translating between Venus and Mars.) What I don't see is your son leaving his mother and living with you, as per your question. The sun is in your wife's (7th) house, and it is past its previous aspect with Mars.
Have you got a good mutual friend who could talk to your wife about the situation? A lawyer?
You can ask this question again in the future, if you wish, after some months have elapsed and if your circumstances change.