Party taking place for 1 year old
Background-
DD ‘ father ‘ never really did much and walked out about 2.5 months ago - used cocaine etc all round useless. Has seen her occasionally since but not much contact
His mother called round 3 weeks ago. She hasn’t been very hands on since DD birth either- has never offered help- but will post plenty of pictures on Facebook 
So 3 weeks ago- the last time we saw her which was also the first time in 6 weeks. I said I’m having a party for DD this time this place on this day, I said I might change the start time depending on an important match.. but I’m not sure yet. Are you coming ? Yes I’ll come.
Fast forward to party day- I haven’t heard off DD grandmother. Her dad asked me if she was attending ( he wasn’t invited for very different reasons which he was fine with ) I said I have no idea she’s not been in touch.
I then get a message telling I never confirmed the time so she won’t be attending as I clearly wasn’t bothered about her being there. And in turn have ruined her granddaughters first birthday.
I mean.. have I ? I guess I could have messaged chasing her up, but did I have to?
Her son left us in an awful position - has that be my son done that to someone who is raising my granddaughter id have done everything possible to help, support and be involved.
I feel like I have to ‘ apologise ‘ but I really can’t work out if I’m in the wrong