Hi allyice, my theory with tantrums has always been to ignore them. Your DD is still very young, so I would be offering a distraction such as 'would you like to come over here and have a cup of water?' and if she doesn't respond and continues the tanty I would follow up with 'well, I'm just going to go over here and have a drink. You can come over and have some water when you're ready'. I think it's important at her age to stay within sight but to ignore the tantrum.

Are you and your DH able to sit down with your IL's and explain to them that this is how you have decided to deal with your DD's tantrums and that you would like them to deal with it in the same way?

And welcome to BB!