Bringing a child to Ireland

I will shortly be marrying my future non-EU wife. She plans to travel to Ireland early next year with her nine year old son.

I understand that to issue a visa to a child Ireland normally requires permission from the child's father. The father is in a third country and has no contact with the child (except a very occasional phone call). Since the father didnt attend the registration of the birth he is not listed on either the child's birth certificate or the child's ID card. The mother doesn't want to contact him (if she is able) unless it is absolutely necessary. Can anyone shed any light on whether this situation will cause any problems in issuing the visa?

Many thanks!

Its not clear if ur gf coming to get married or she was in ireland before???which stamp she has???

We will get married in January, I will travel to Ireland in March and she and her son hopefully will follow in April.