Brother in law is getting married in the summer. The wedding is being held 500miles away from where we live and will cost approximately £1000 for the weekend away to attend (summer weekend in expensive area). We will have to take our young toddler to the wedding as they want them to attend for family photos etc. We are not part of the wedding party - my husband is not best man etc, we are guests at the full day though. It will be a very long weekend for the toddler and not particularly enjoyable for them. In laws are useless with them so no support there.
We barely see this brother despite living in the same city as him. Husband does not have a close relationship with him. Him and his future wife make no effort to see our child (have seem them maybe 3 times in 18months and only at other family obligations) and didn't attend their 1st birthday etc despite it being important to us.
This weekend away is barely affordable. We do not have a spare £1000 to attend a wedding for 2 days. I do not feel we should be obligated to go when we are not friends. We would not go to the wedding of someone else that makes so little effort in our lives.
Husband feels we are in a tricky position. He agrees that it's very disappointing the lack of effort they make to see us or our child but that it will cause a lot of family upset if he does not attend. He was initially in agreement we should not go but now feels fearful of the fallout.
AIBU to decide not to attend this wedding for the reasons above.