Would it be impolite to not give a gift to someone who gave you a gift?

Just a question I thought about and got curious to know other people’s answers. I’ve been going out with my bf for almost a year officially. At Christmas and on my birthday, I unexpectedly received some gifts from his sister, mom, and his aunt. Things like giftcards, cute sweater from American Eagle, socks (which I actually appreciate as a gift lol!), mini bath and body works stuff, or Victoria Secret make-up.

I didn’t know I was getting these gifts and I didn’t give them anything at all. I felt bad. They do pretty well for themselves financially but me on the other hand, I don’t make enough all like that. So maybe a small gift would be ideal. Next time on their b-day or Christmas I’d be thinking about getting a small gift but I don’t want them to think, “Oh she’s just getting me a present just because I got her one.” or “She got me a gift cuz I got her a gift last year…but since she didn’t get me a gift last year I don’t have a gift for her” lol I’m looking way into this huh?