What to do instead? (Please see details)

Because of some nasty internecine squabbles in my family, I won’t be attending the wedding next year of my sib’s child. I am close to the young couple, so I would like very much to do something nice with/for them to honor this occasion. I’ll be giving them a nice wedding gift, this is different. Any suggestions?

Please don’t tell me why I should attend. That is an entirely separate issue.

Thank you

Edit to add: We are geographically separated by 1,500 miles, but I am willing to travel to them.