Children grieve just as adults do. They should be assured that it is all right to express their feelings. When children lose someone with whom they have been extremely close, grief counseling may be in order.
Advice Columns - Columnists Quotes
If either the bride or groom has second thoughts about their feelings, it would be far better to call the wedding off. While it may cause the other party to be upset, in the long run, it would be far better for all concerned.
If the boy is old enough to get a tattoo he is old enough to go alone.