frenchfrogz.
He's your child! You decide!
I am a granny. I would never think of saying I want "unsupervised" time with my grandchildren!
I have looked after them from time to time to help my children out but only ever on my children's terms and have followed everything my children tell me to do. I strongly believe this is important. Not because I can't look after children without being told what to do - I'm well qualified to look after them in fact. But it is very important that my children know that I respect them as parents.
It is important to me that my children know I see them as the parents of the grandchildren and I know they know what is best for them. Because they are my children they might still have this residual feeling of doing what I tell them, so I try to make sure they know that, where their children are concerned, I take orders from them - they are the Boss!
You know what is best for your child. If you do not want or need a regular arrangement for your son to see his Grand Ps with or without you, then don't feel under pressure to arrange one! Do not do anything regarding your children that you do not want to do. Do not do things with the children just to please your parents!
You might be your mother's child but you are grown up now and you're in charge! Don't worry about the anxiety! You coped with it! Well done! Loads of us get it. Don't let anyone tell you that they must help you because of it! You will ask them to look after the child/ren if and when you want to, for whatever reason you want. Tell them that.
Practise what you are going to say as your answers, in front of the mirror if necessary, so you get used to this firm voice of yours telling your mother "Thank you, I will let you know when I'd like you to baby-st / have my son with you." or "when we shall visit you." and "There is no need for him to stay with you without me, I am not too busy." or say whatever you need to say.
Just out of interest, when my second baby was born, I didn't want my first, who was 3, to be taken away and "looked after" as everyone kept thinking I did. It annoyed me that so many people kept turning up and saying "I'll take little G back with me to give you some peace." or my SiL saying "I'm taking little G to the Park to get her off your hands." It absolutely annoyed me! My dear little girl was not "On my hands" and she did not stop me having "peace". I enjoyed her company, more than I enjoyed theirs! I wanted her there, with me and our new baby!
So do not be bullied into letting DS1 go away to be looked after when the baby arrives. If you do not want him to go away, say firmly that he is staying with you. My first child was a real help with the baby and absolutely loved her baby sister!
I hope I've helped. Please only do what you want. Do what is right fo your family, your children. It doesn't matter what others do or say or what your mother wants. You are the mother of your children. You organise life in your home (with their father obviously!) Everyone else (your mother) has to start recognising this and stop speaking to you as if you are a child.
You put it so well: "I really don’t want to live on someone else’s schedule." Just tell them that - preferably saying "*I will not live on* ...." and say it's not negotiable. Your son is not an object of amusement for his Granny, he lives his own life.
As for sending him away for a once a week "unsupervised" visit just to please the granny! That is rubbish!
Rather than saying; "^I just don’t see the need^ to drop him off just for the sake of it". Say "*I shall not* drop him off just for the sake of it." and when they start saying "Oh it's not for the sake of it he will be ...." you turn away and say "There is no more to say. He is not being dropped off and collected later. There is no need. If there is a need or emergency at some point, then I will ask."
She should be jolly glad she sees him as often as she does! Mine live hundreds of miles away! I haven't seen them for about a year! Indeed you could say that you don't want to hear any more about it or you won't be visiting as often in the future! Start taking the upper hand. I think the problem is that she is bossing you about and you feel cowed by her because you have been used to her doing this all your life. Now you have changed! You are the mother! You give the orders! She does as you tell her!