OrangeK, I know how hard it is to 'co-parent' with a little kid. It's good news you're able to share pictures when your son is with the other parent. I also still think you have the right to intervene if your son is sleeping in the other man's bed or in his care for a significant amount of time and you don't know the quality of care or environment. I have no idea what you can do legally but that does sound suspicious that your MIL didn't respond until late, although it sounds like she must be supportive of OM caring for her grandson so that's not very helpful. I'm not so sure about getting into texting conversations with your wife to check your son's whereabouts because you may not get the truth and it may cause more contention, but it sounds like general positive comments like "he had a great time" or "here's a picture of him having fun" are a step forward since you'll be doing this for another fifteen or so years so eventually you and your wife will have to learn to cooperate.
