Originally, I had planned on having an adults only reception. However, I have realized that my fiancé's 2 half brothers and half sister will not be able to attend if we do not invite their children (6 kids in total ranging in age from 6 -15). They are all from many states away and do not have family where they live to leave their children with. It is not an option to invite all children as that would add about another 30 people to our guest list and we are already about where we wanted to be. Is it ok to only invite my fiancé's nieces and nephews and not invite other children?