My FI and I will have 5 nieces and nephews by the time we are married. My FBIL just had a boy in July and I just found out the my SIL is due within a week of our wedding (so excited!) Even though the two little ones obviously can't walk down the aisle, can I put them in the program as FG and RB? I'd like to include the whole family, since they're all so important to us.