These people were eager to adopt Aaron and apparently raise him in Melbourne. They were willing to pay 20k before and 20k after the birth. This could be normal for wealthy couple's wanting to adopt, IDK. Seems like ALOT of money for an unwed mum with no extraordinary qualities.
Did they know he was special? Is there any evidence of them being connected to Widmore, DI, Hanso, Alpert, or anything like that? The "danger" Aaron posed was if someone else raised him. It was almost these people.