This is a popular thread! Just thought I would give you my views as well. My son is 25 months and he is adorable, a good boy and I love him to bits. Now I am very close to my son and cant bear to be without him but as he is getting older I dont want him to be, how can I put it 'a mommies boy'.
Bit of a different situation for me as to cut a long story short, I was told I could never have children so obviously when I became pregnant I was over the moon, nearly lost him twice during pregnancy so I guess I am a bit protective.
I will try not to babble on but what I am trying to say is that it works both ways, it is important for your child to form close relationships with your parents just as it is for you and your partner to spend 'quality' time with one another.
I am sure your child would love to stay with his grandparents just as much as they would love to have him. I am sure he will get spoilt with lots of affection, which unfortunately we cant show 24/7!
My son stays at my mums once a month, this gives my partner and myself a well earned lie in and gives us time to remind each other how much we care for one other. Sometimes we go out for dinner or stay away in a hotel or just being at home relaxing and having some 'me' time is wonderful. If I am honest I still get upset when I get into bed and feel guilty about leaving him, after all he is my responsibility, right? I miss him, its crazy its only a few hours!
Leaving your child for a night does not make you a bad mother, if anything, it makes you appreciate your child more. I am sure you will do what is best for you.
Good luck
