Dhamma (in its sense of Dhammata) takes care of all this.
Lang states that at the very end, but, in my case, the bit about relatives, children coming in the way does not apply. All my (mundane) responsibilities in that direction were already fulfilled by the time I entered the Path. Where there are still those responsibilities to contend with, it is certain that Dhammata has the solution. Have no fear.
Again, Lvalio, how to proceed if I “have lost attachment to this human world, became a…” but I CAN simply let myself die (because my duties to those to whom I owed dues have been fulfilled.) So it makes no difference to me whether I die tomorrow or today and be rid of human existence once and for all. Important is to ever keep mindfulness, even if passively,if the energy is not always there.