Nmmaikra.......I’ve just skim read the replies as I wanted to address the op first, so forgive me if I’m repeating others adcice!
Cakes, I fell into this dilemma as a gran, and now think it’s best to let both grans make a cake saying you will be starting your own tradition now too! So what if there are 3 cakes!! If you show you dont mind they will follow and no doubt give up on the idea over time!
Make it into a joke (look how lucky my son is to have such a doting family etc.!)
Gmums:
Clearly your mum is showing as many signs of ‘owning’ her rights as a GP as your mil, or she wouldn’t have assumed she would be THE cake maker and burst into tears (a bit competitive imo)!!
So don’t be too selective in your observations of who is feeling entitled and who isn’t 
Shoes etc., accept gracefully saying (truthfully) it doesn’t bother you too much what his clothes etc. Are made from, but if they’re happy to carry on buying for him your happy too, BUT could they ring beforehand and you will give them a list to choose from of things he needs - that way you are in control and they get the pleasure of giving.
Them hovering and getting in the way:
How do you feel about them babysitting whilst you take the youngest out for a walk? Or they take the eldest to the park and give you a break for a while?
Don’t forget to explain nicely how tired you have been and how hard it is to find time to cook for yourselves let alone guests! Maybe they will take the hint and cook if you repeat the story often enough 
My extended family turned my home into their unofficial go to holiday destination because we were by the sea! So every year we were inundated with hoards of people wanting to see the kids and have a freeby!!!
I wish I’d had someone to give me this advice then!
good luck!
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