well zoe, I hope that you figure it out. The reason I can be so blase about gift giving is that my family and DH's too are not materialistic people when all is said and done. DH's family gave gifts when all of the nieces and nephews were little, and small adult gifts just sort of happened along with that. Christmas gifts are for kids. When they all grew up everyone lost their enthusiasm for it.
I remember when my black sheep sister-in-law first proposed "please let's stop presents" for DH's family but that did not go over, she's not the leader of the siblings. But she DID plant the seed, and a few years later the tradition was given up. I also think it's weird that your parents don't cut you slack. We are the age of your parents and DH and I would be glad to NOT get presents from our kids. Lovely family Christmas experiences can be had by all without gift giving, and it is too bad that when you mother wails "but it is Christmas!" she can't think of anything besides gifting to celebrate it.
You can use the "love language" stuff but really, it's about sharing values. You don't share the values of your family and you can't change that and probably you won't experience a "real" connection for any sustained period, harsh as that may be to contemplate.