Don't know about free books on breeding, I bought all mine lol. Maybe check your local library?
Laying eggs doesn't mean they mated. If you never saw it happen and the eggs were infertile, I'd bet they never mated. They may not know how or not realize they need to. Just because two birds are paired together doesn't mean they should be making babies. If your uncle and family are afraid of the birds already, I don't really think breeding them is a good idea.
Thanks DallyTsuka for siggy!
Snowball-whiteface cinnamon cock
Jeep-normal gray cock
Pebbles-whiteface pearl pied hen
Pankakes-PF cinnamon pearl pied cock