So after months, maybe years, of telling them that it was worth their while to take omega-3 supplements, and that they wouldn’t get nearly enough to do them any good from eating fish a couple times a week, I finally forced it on them. I got my parents two massive bottles of fish oil capsules for Christmas which, if they take 2 each per day, should be enough to last them over 4 months. Now they take them religiously; keep them in the fridge and everything.
Sometimes you just have to force a person’s hand. Sheesh, what a struggle it was for a while, though! Try just forcing it on the people you love.