What to write as a thank you to partners parents

I have bought a gift and a thank you card for my partners parents who have welcomed me into their home. They invited me to live with them (which i have done for a year), paid for a holiday for me and my partner, taught me to drive, helped to get me a job at the care home i wanted and are now helping us move into our first home together. I dont know how to thank them in words for all they've done! We do not have an overly close relationship (they are not the mushy type!) so i am stuck as to how to word it. Any ideas?

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