curious, I'm having 2 baby showers, one is being hosted by my grandma, in her home, should I get a…

curious, I'm having 2 baby showers, one is being hosted by my grandma, in her home, should I get a gift for her, or would a thank you card suffice? Now my second baby shower I'm hosting it in my home, but one of my best friend's is planning most of it, should I get her a gift? or would a thank you card suffice? we are extremely strapped for cash, but I don't want to seem rude or unappreciative...