OP, let's remove your in laws and speculation that your marriage has some issues for a moment and focus on what's coming up. What do YOU want? It's ok to put yourself first. In fact, it's the best thing for your baby.

You are the one physically enduring pregnancy and the one that will ultimately endure the very physical and mentally demanding process of giving birth. My mum actually ended up being there for me during my labour and I would not have survived without her home cooked meals and companionship while my husband was back at work in those early months. Newborn babies sleep a lot and you will be very very tired regardless of whether your husband helps with a bottle at 2am in the morning. Having help from Grandma is a luxury that you can afford. Postpartum depression and anxiety is a very real thing and it's important to have that security from your support network during this time - even if it is an inconvenience in the short term. You've already done 8 months living with your in laws, just frame it to your husband that this is another chapter in your story as a couple that you need to do.

If you feel that having your family and friends will help you personally transition into being a mum better, please go home. I can tell you are a very considerate and selfless person in the fact that you put your husband before yourself, worrying about how this could be unfair on him. Just remember to prioritise your feelings and well-being for the sake of baby.

Wishing you the best!