My understanding is, the more you have engraved on a grave marker, the more it costs. This likely stops most people from putting too much on a tombstone. I’ve seen lots of nicknames and family references, like “our gran-gran,” or “beloved son, brother and uncle,” or sayings like, “With Our Lord,” or “Together forever.” I’ve also seen short phrases from Scripture on grave markers in Catholic cemeteries. Check with the people who manage the cemetery, but I think if it’s not offensive and you can afford it, it’s probably okay.