A Family Dilemma Do I Speak Out?

[gordiescotland1]

Hi there I am in a difficult situation my sister is getting married on Saturday 60 miles away she said that they want a low key affair her 2nd marriage and they have been living together for 10 years. She invited mum and dad and they asked her if she would mind if they didn't come and she said that was ok. It will be her 2 sons and his son. Now she had been texting my brother and me today saying she is very hurt and offended that they are not going and she doesn't want to see them for a while. But mum is giving them money for a meal out as her contribution. But she says that mum is small minded not even asking about the wedding. I see I have 3 options. 1. Speak to mum and tell her she is making a mistake by not going and she will regret it. 2. Invite myself to the wedding or 3 the most difficult say nothing ??

[Lizruns]

What do you do in the end?