FTM here and my DS is also the first grandchild for both my mum and MIL.
My family seem to be assuming that we'll be throwing DS a party. In some ways, I think it'll be nice to do that. But on the other hand, bringing my family together with DHs brings out the worst anxiety in me. Have gotten away with only having to endure it for the wedding. They got along fine but my family is a little rough around the edges and I get so embarrassed. I also think it's not really necessary for DS as he will just be 1. I'd rather just do something as a three (me, DH and DS). It'll be cheaper and I'd enjoy it way more.
What did you do when your child(ren) turned 1?