Hi Kevin.
You should remove the young from their parents now. Only house 2 lovebirds per cage.
You can put the young in a large flight cage if they don´t pair up then move one out to their own cage. Remember, it´s not right to let brother/sister breed so if you let them pair up, remove any eggs from them in the future. Also, not all brother/sister relationships survive past sexual maturity. So monitor them closely.
Don´t feel bad about removing the birds, keep the cages in the same room and allow shared out of cage time, they could still remain as a family unit. But they do need their own homes.
Keep in mind, if those young birds are there when you hen lays, she will attack them and could kill them.
Also, Your birds are not the same species, so all babies are hybrids. If you give them away or sell them, you must disclose that.
It is not recommended to allow your birds to create hybrids.