I've been honoured to be a god mother to 2 children- 1 DH's cousin and 1 my own 2nd cousins child. Both children have siblings and I have always given the same gift amount to their siblings for birthdays and Christmas along with each god child.
1 godchild is approaching 18, and I was planning on giving a large cash amount-maybe £50-£100. Do you gift to all godchildren's siblings the same amount? Am I setting myself up to give the same to siblings when they each turn 18? Do you continue to sent gifts/money after 18?