I must say I am quite surprised at the vitriol towards your SIL from the other commenters: She is described variously as 'nasty... self-centred... inconsiderate... toxic... disgraceful... childish'. What crime has she committed? Why, she forgot your birthday by one day and then posted well-wishes about it on Facebook, which I agree is non-sensical if you are not on Facebook, (she might have forgotten? So many people are on Facebook these days), but you seem disproportionately bothered. You say too that you stopped buying presents for her side of the family as they rarely said thank you. So you were buying them presents in order to be thanked because when the thanks diminished, so did your presents. I send birthday and Christmas wishes to my brother every year, sometimes he forgets to reciprocate, sometimes he remembers late. So what? He loves me. He says it eventually. I have scatty, busy friends who don't always remember my birthday, or who don't follow social etiquette to the letter, but I know they are there for me in times of need. Your SIL DID wish you a happy birthday. And she also picked up the phone to call. you later. You could be a bit more generous in your interpretations of her behaviour. You say 'Point is SIL forgot my b'day.Absolutely no problem.' It sounds like it IS a problem and my advice is to focus on the positive. Cut her some slack. Be pleased she did contact you, in however an inept a way, and try to see what good you can in her actions.