We are having an adult reception (13 and up). FH's dad and sister were made aware of this but still refused to attend (said they wouldn't give us a wedding gift either) if we didn't invite her two little girls (4 and 1 year old). His sister has attended 3 other weddings where her kids were not invited and didn't have a problem. We are paying for our own wedding and could not afford to invite all the adults we wanted to let alone everyone's kids. Should we break the rule for her since they are my FH's nieces or should we stick to our guns?