Girls am I over reacting? Literally had a bit of a barney with OH over his bloody mothers actions.…

Girls am I over reacting? Literally had a bit of a barney with OH over his bloody mothers actions. First she says yesterday that she can't remember when Evelyn's birthday is (even though she remembers his brothers kids birthdays) so she then feels guilty and says she will get her a cake and that we will need to get it from her today while she's at work. He goes over to collect it and she has her phone switched off and surprise surprise she's forgotten the cake. Bearing in mind this was all arranged last night. He's now saying that it doesn't matter and she doesn't need a cake. Umm it's her birthday and she does need one because she been practicing blowing her candles out for weeks lol