User blog comment:DYBAD/Character Sheet/@comment-26362471-20170810203854/@comment-4867780-20170811110452

As mentioned in the previous thread, conceived children who join the Legacy Heaven are simply too many for their original family to keep up with, and only visiting a select few would be unfair to the others, so they all live independently from their original family (although their mutual daily access to the Metaradise allows them to indirectly bypass these limitations and freely catch up to their heart’s content – see the last paragraph of "Selforge Metaradise").

Each fertilized egg gives birth to a single baby (one egg cell, one sperm cell, one baby), so there is no twins or triplets in Selforge City nor in the Legacy Heaven, making the related complications nonexistent as well.

Each bubble-world is individually created for each child, and becomes the equivalent of their personal Selforge Domain when they move on to the main Legacy Heaven, freely accessible at will for any length of time thanks to its flexible time flow that minimizes their external absence to insignificance, ensuring no one really misses or is missed by anyone.

As for their own children, it depends where/when they were born. If it was in their mother's bubble-world before she joined the main Legacy Heaven, then they grow up here as well and follow her when she leaves. If it was after she joined, then they grow up in the sisterly community their mother now belongs to, and have no need for a bubble-world of their own.