My younger sister is getting married next year and no children (including family children) are invited to any of the wedding celebrations. We will have two children by then (aged 2.5 and 6 months). They are the only children in the family.
The wedding is 2 hours drive from our home and over 3 days - starting on Friday and ending on Sunday.
Our blood family only consists of my Mum and Sister and so I'm disappointed that my Sister would not want her nephew/niece there or want to include them in the day (and that there won't be any photos of them there). I work full time and weekends with my children are important to me and so I'm sad to have to spend 2 days away from them.
The expectation from my Mum and Sister is that me and my husband attend the wedding without our children without complaint and sort and pay for any childcare arrangements that are required.