My fiancee has 3 kids and due to issues with his ex she will not allow him 2 see his kids they are small and we really wana incorprate them into our wedding celebration to show them that we do care alot about them and was thinking of them on our day, because there not alot we can do about inforceing the custody till we get money for a lawyer so at this time it doesn't look like they will b there cause the wedding is in Sept 9th. any help would be appreciated.

You should look into legal aid, most places have lawyers for low income people, and many lawyers will also look at certain situations and may be able to set up a payment plan to help you out. You MUST get a lawyer as soon as possible.