My in-laws (who are not Christian) also do multiple gifts per person. I once suggested to my SIL that we just exchange gifts for the kids, but she balked at that. So she gives my family a gift for me, a gift for my husband, one for each kid and then an additional gift for my family. We give her a gift for her and BIL and one for each kid. She hasn't complained that we give 3 gifts total and she give 5 total so that's what I've been doing the last few years.