I almost never heard either of my parents swear, in English, Danish, or Swedish. I would sometimes hear my dad say "för helvete" (hell) if he got really angry. If my mum used a swear word, it meant that she was really, really angry. All her friends knew it was really serious if she let out one of those words.
She wouldn't even say, "I hate his guts." She would say "I dislike his guts." which, with a Danish accent, was always pretty funny.
May you live as long as you wish and love as long as you live.
Robert A. Heinlein