At the risk of sounding curmudgeonly like Larry David, what's the protocol on an in-law.
Not a blood relation.
If spouse's brother, then onus is on spouse to make the gesture. If married to sister, then how close is the relationship? I have one brother-in-law and I didn't even send a card for his 50th earlier this year, though did fund present from kids to him.
My sisters-in law have had 'zero' birthdays in recent years and my wife (their sister) organised the present thing.