Raising children in the 4th -5th - 6th densities

[anagogy]

If we mate and have children in the higher densities, I wonder what happens with the children given it is my understanding that we all must journey through 3rd density.

Do we bid farewell and off they go?

Keep in mind that conscious souls choose their host bodies. You chose the body you are presently incarnate in. The same is true for beings inhabiting a higher density body. 4th density souls (who had already been through 3rd density evolution) would incarnate in the body complexes created by 4th density reproduction processes. Also, there is no veil in the higher densities, so the the children that are born aren't blank slates, and in fact, the souls may have extensive dialog with the "parents" as it were prior to physical incarnation in that framework of density.