Consult things with your L. If she wants to take your son to her parent's place, then she should do it on her time. Not yours. Just as if you wanted your son to spend time with your relatives, you would do it on your own time. Specify that with her and be adamant about it.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.