13 month old will not sleep more than 2 hours

Gemma 🦄
I honestly don't know what to do. I'm at my wits end, my son will not sleep and I have tried every single thing to get him too. He's never slept, I'm up 10-15 times a night every night and he won't settle without either being fed by me or a cuddle to sleep. 
He's not sick or has health issues
I've tried sleep training multiple times 
And he sleeps a solid 6-7 hours for his grandparents despite us doing identical things. 
He refuses to cosleeping with me and my partner but does it at his grandparents. 
I can't really cope anymore I'm so depressed and exhausted and please somebody have some kind of idea??