https://www.paperlesspost.com The sentence ‘Together with their families Carrie and Robert request your presence at the ceremony and celebration of their marriage.’ could possibly be restated as…

Carrie and Robert are invited to come to your wedding with their families.

Carrie and Robert don’t expect your presence at the ceremony of their wedding.

Carrie and Robert are asked to come to someone’s wedding in order to celebrate it together.

You aren’t expected to come to Carrie and Robert’s wedding because it’s very special and sacred.

Carrie and Robert along with their families ask you to come to their wedding’s celebration and ceremony.